AIR TECH SYSTEMS Technical Brochure LTG Air Diffusers Linear air diffusers Installation in ceilings, walls and sills
Technicalbrochure Linear air diffusers LTG Comfort Air Technology Air-Water Systems Air Diffusers Air Distribution Notes Dimensions stated in this brochure are in mm. Dimensions stated in this brochure are subject to General Tolerances according to DIN ISO 2768-vL. Length tolerance : 1.5m±1.5mm 1.5m±2.0mm For the outlet grille see the special tolerances specified in the drawing. Straightness and twist tolerances for extruded aluminum profiles according to DIN EN 1-2. For punched profiles - 12 and - twice the straightness and torsion tolerances acc. to DIN EN 1-2. The surface finishes meet standard indoor use requirements, i.e. room climate requirements according to DIN EN ISO 77. Other finishes meeting special use requirements are available on request. The actual tender documentations are available in word format at your local dealership or at www.ltg-ag.com. Please note! The profiles for our linear diffusers are exclusively de-signed for use as decoration elements to cover the gap between the ceiling and the diffuser. They are not suitable for use as supporting profiles or fasteners! Content Page Product overview 4 General description 5 Diagram for air only systems 6 Selection diagram 7 Selection 12/8 and 12/M 8 Dimensions 12/8 and 12/M 9 Border profiles / additional profiles for 12/8 and 12/M Insertion loss 12/8 and 12/M 11 Selection /8 12 Dimensions /8 13 Border profiles / additional profiles for /8 Insertion loss /8 Selection 12 and 16 Dimensions, border profiles for 12 17 Dimensions, border profiles for 18 Selection 50 19 Dimensions, border profiles for 50 Installation 21 Accessories 22 Nomenclature, ordering code 27 14 Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page 2 of 27
Technical brochure Linear air diffusers Air Diffusers for Ceiling Installation linear air diffusers with variable settings ensure effective ventilation and optimized air conditions. Advantages Comfortable: High induction air diffusers ensure rapid mixing of supply and room air to create comfortable thermal environments Uniform, optimal purging of the room with fresh air A pleasant indoor climate thanks to uniform temperature distribution Quiet: Low-noise air distribution, aerodynamically optimized inner cylinder contours Variable: Limitless options for design, colour and surface appearance, can be perfectly integrated in all ceilings LTG System clean - unique and ingenious! Contaminants within the room air like dust, tobacco smoke, carpet abrasions, dust or oil vapour deposit around the ceiling and diüfiuser as a result of entrainment. The LTG System clean prevents surface staining almost completely by providing a screen of clean supply air across the ceiling. Benefits: The costs of renovation and maintenance are considerably reduced. Flexible: Can be adjustedto individual spatial conditions without impeding operation Profiles are available in all colour systems (e.g. RAL, Pantone, ) and can be combined individually Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page 3 of 27
Technicalbrochure Linear air diffusers Product overview Type Air diffusion Special features 12/M 12/8 /8 12 LTG System clean LTG System clean Individually adjustable air flow Completely made from metal, nonflammable LTG System clean to reduce contamination around the diffuser Individually adjustable air flow, even after installation For high comfort For high comfort For an inconspicuous installation in shaded joints and suspended ceilings Profile width [mm] 41 129 31...240 31...240 resp. 28 Cylinder Ø [mm] -- 12 12 1slot: 70 65 Recommended [m³/hm] 2 slots: 1 air flow rate 3 slots: 190 at L WA [db(a)] 1slot: 70 2 slots: 1 3 slots: 190 5 slots: 250 1 slot: 1 2slots: 190 3 slots: 250 4 slots: 0 Slot rows 1 3 1...4 1...4 1 Recommended installation [m] from 2,4 from 2,4 from 2,6 from 2,4 height Length [mm] up to 2500 up to 00 up to 00 up to 00 Profile surface: untreated aluminium, anodized, painted similar to RAL. The diffusers can alternatively be ordered without air distribution box. Version Accessories Diffuser elements: natural anodized, painted similar to RAL Diffuser elements: black, white or aluminium grey, on request in other colours similar to RAL For integration in the ceiling, a variety of border and additional profiles is available. 35 Type LTG System clean 50 Air diffusion Individually adjustable air flow, even after installation Special features LTG System clean to reduce contamination For high ceilings and large flow rates around the diffuser Profile width [mm] resp. 25 0, 0, 0 Cylinder Ø [mm] 50 Recommended air flow rate [m³/hm] up to at L WA [db(a)] 25 Slot rows 1 1...3 1 slot: 3 2 slots: 4 3 slots: 5 38 Recommended installation [m] from 2,4 from 3,5 height Length [mm] up to 00 up to 20 Profile surface: untreated aluminium, anodized, painted similar to RAL. Version Diffuser elements: white or aluminium grey, on request in other colours similar to RAL. The diffusers can alternatively be ordered without air distribution box. Accessories For integration in the ceiling, a variety of border and additional profiles is available. Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page 4 of 27
Technicalbrochure Linear air diffusers General Description Product views Type 12/8 LTG System clean Type 12/M LTG System clean Type /8 Type 12 Type LTG System clean Application LTG diffusers type are suitable for all kinds of applications, e.g. rooms with: - high comfort requirements such as offices - increased heat loads and fresh air requirements such as labs or conference rooms - special requirements regarding acoustics such as broadcasting studios - constant temperature requirements such as production halls. LTG diffusers type are perfect for both supply air with a constant or varying volume flow rateand returnair with the same diffuser element adjustment. Installation, positioning LTG diffusers type may be installed in ceilings, walls or sills depending on the looks desired, the existing air conditioning system and the intended use. Also available are diffusers for special requests. Flexibility regarding the interior design, by ensuring both the use for an inconspicuous installation and as an eyecatching decoration element. Function The LTG diffuser type is an adjustable linear diffuser allowing treated air to be distributed precisely within the room, thus ensuring both highest thermal and acoustic comfort. The diffuser consists of diffuser elements with an optimized interior and profile contour, mounted in aerodynamically harmonized aluminium frames. Each of the diffuser elements can be adjusted individually, thus permitting a large number of different flow patterns, varying from a flat ceiling flow to a broad fan jet with a maximum of 36 micro-jets per meter diffuser length (exc. ). These features ensure low air speeds and a rapid reduction of temperature differences within the room, some of the basic requirements for agreeable conditions in the occupied space. The highly inductive effect produces a stable flow pattern and permits supply air temperatures up to 12 K lower than the ambient temperature. Type 50 Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page 5 of 27
Technicalbrochure Linear air diffusers Selection Diagram for air only systems 0 0 Specific cooling capacity [W/m 2 ] 0 90 80 70 50 40 cmax =0.m/s cmax =0.18m/s cmax =0.m/s cmax = 0.5 m/s cmax =0.25m/s 5 6 7 8 9 12 14 16 18 25 35 40 50 Specific volume flow rate [m 3 /(hm 2 )] 1.5 2 3 4 5 6 7 8 9 12 14 16 Ventilation rate [1/h] based on a room height of 2.75 m Use of the diagram Based on the known value, i.e. the specific cooling load, the specific volume flow rate can be calculated by choosing the corresponding temperature and volume flow rate of the supply air depending on the desired room temperature of 22 or 26 _C respectively. DIN limits should, however, be observed to avoid draft andothersourcesofdiscomfort. If the ventilation rate is too high, additional means to reduce the cooling load should be considered already during planning (e.g. sun screens etc.). Example: An office area of m 2 (room length 6 m, room width 5 m) requires ventilation and cooling. The desired room temperature is 26 _C. With a specific cooling capacity of 40 W/m 2 and Δt=-K,thespecificvolumeflowrateis12m 3 /(hm 2 ). The supply air required is 3 m 3 /h. 5m Floorarea =m 2 Room temperature = 26 C Flow rate = 3 m 3 /h Δt = -K 6m Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page 6 of 27
Technicalbrochure Linear air diffusers Selection Selection diagram 12 8 Installation height [mm] 6 4 3 2 40 50 70 80 0 0 0 400 500 Flow rate per meter of diffuser [m 3 /(hm)] With the volume flow rate known and the installation height taken into consideration, a quick decision can be made regarding the appropriate number of slot rows and the diffuser type. Since there usually is a choice of products, the diffuser type that suits the application best may be selected. Example: Based on the example opposite, a volume flow rate of m 3 /(hm) is obtained. With a room height of 2.75 m, 12/8/1 LTG System clean R would be perfect, but /8/1 might be installed just as well. Diffuser Type 12/8/1 LTG System clean R with a volume flow rate of m 3 /(hm) was selected. 5m Example: Return air, e.g. through lamps Supply air through linear diffuser 12/8/1 LTG System clean R Facade 6m Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page 7 of 27
Technicalbrochure Linear air diffusers Type 12/8 and 12/M, LTG System clean R - selection Selection diagram t [K] -3-6 - -12 a(c max ) c max a(c max ) [m] 2 1 0,5 40 50 80 0 0 0 p [Pa] 50 40 c max [cm/s] 12/8/1, 12/M/1 With undisturbed air diffusion 12/8/2, 12/8/3, 12/M/2, 12/M/3 With undisturbed air diffusion t [K] -12 H= 2,8m t [K] -12 - -6-3 h= 1,7m H= 2,8m - -6-3 h= 1,7m 25 35 5 40 80 0... = dimensioning area beyond LTG System clean 0 0 V[m 3 /(hm)] Legend V = volume flow rate [m 3 /(hm)] t zu = supply air temperature [ C] t RA = room air temperature [ C] Δt = temperature difference between t zu and t RA [K] Δp = pressure drop [Pa] L WA = sound power level [db(a)] a(c max )= extension of jet at which the maximum speed of the ambient air was measured [m] c max = maximum speed of ambient air with uniformly distributed thermal loads [cm/s] H = room height [m] h = height of measuring point [m] Note: The recommended min. distance between two parallel diffusers should, in case of high temperature differences t, not be less than the value of a (c max ). The diagrams are based on measuring results with the standard diffuser element adjustment and a room height of 2.8 m. Example for diagram above Volume flow rate per meter of diffuser: V = m 3 /(hm) Resulting data for type 12/8/1: Δp = 7 Pa L WA = 17 db(a) Δt = - K a(c max ) 1 m c max 5 cm/s Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page 8 of 27
Technicalbrochure Linear air diffusers Type 12/8 and 12/M, LTG System clean R - dimensions Air distribution boxes 61 61 92 2 145 * 265 * 250 * 65 12/8/1 12/M/1 12/8/2 12/M/2 12/8/3 12/M/3 Profile details see next page Profile details see next page Profile details see next page Air distribution boxes with insulation (doubleskinbox) 91 45 91 45 122 45 225 * 280 * 265 * 64 12/8/1 12/M/1 12/8/2 12/M/2 12/8/3 1/M/3 Profile details see next page 67 Profile details see next page 67 Profile details see next page * Execution: integrated throttle damper DLU at spigot diameters 99...139 The values given refer to standard versions. Reduced box sizes and spigot diameters are available on request, depending on volume flow rate and acoustic requirements. Spigot dimensions Diffuser length L nom [mm] 500 750 00 1250 00 1750 00 The given values L WA refer only to the execution without throttle damper resp. with throttle damper open. 12/8/1, example: 70 m 3 /hm L WA in db(a) out of diagram p. (ref. to L nom ) 19 21 22 23 24 24 25 Ø=79mm no. of spigots / 1/[-2] 1 / [+3] 2/[-2] 2/[0] 2 / [+3] 2 / [+6] 3 / [+1] Ø=99mm [correction to diagram in (db)] 1/[-4] 1/[0] 1 / [+5] 2/[-2] 2/[0] 2 / [+3] 2 / [+5] Ø = 124 mm standard version highlighted 1/[-5] 1/[-3] 1 / [+1] 1 / [+4] 1 / [+7] 2/[0] 2 / [+1] 12/8/2, example: 1 m 3 /hm L WA in db(a) out of diagram p. (ref. to L nom ) 24 26 27 28 29 29 Ø=79mm 1 /[+1] 2/[-3] 2/[-1] 2 / [+2] 3/[-2] 3/[0] 3 / [+2] Ø=99mm no. of spigots / 1/[-2] 1 / [+2] 2/[-2] 2/[-1] 2/[0] 2 / [+3] 3/[-1] [correction to diagram in (db)] Ø = 124 mm standard version highlighted 1/[-3] 1/[-2] 1/[0] 2/[-3] 2/[-3] 2/[-1] 2/[-1] Ø = 139 mm 1/[-3] 1/[-3] 1/[-1] 1 / [+2] 2/[-3] 2/[-2] 2/[-2] 12/8/3, example: 190 m 3 /hm L WA in db(a) out of diagram p. (ref. to L nom ) 22 24 25 26 27 27 28 Ø=99mm 1 / [+4] 2/[0] 2 / [+4] 3 / [+2] 3 / [+4] 4 / [+3] 4 / [+4] Ø = 124 mm no. of spigots / 1/[0] 1 / [+5] 2/[0] 2 / [+2] 2 / [+5] 3 / [+2] 3 / [+3] [correction to diagram in (db)] Ø = 139 mm standard version highlighted 1/[-1] 1 / [+2] 1 / [+6] 2/[0] 2 / [+2] 2 / [+4] 3 / [+1] Ø = 9 mm 1/[-1] 1/[0] 1 / [+1] 1 / [+3] 2/[0] 2 / [+1] 2 / [+1] Example: L WA =L WA (out of diagram in page 9) + [correction value], 12/8/3, length 00 mm, 2 x Ø 139, L WA =27dB(A)+2dB=29dB(A) Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page 9 of 27
Technicalbrochure Linear air diffusers Type 12/8 and 12/M, LTG System clean R - accessories Various border and additional profiles are available for LTG linear diffusers series and LTG System clean R ensuring a perfect integration in and adaptation to all kinds of ceiling systems. Thus, both aninconspicous installation of the diffuser and its use as an interior design element are possible. Profiles may also be used in combination with each other. Border profiles for type 12/8 LTG System clean (more border profiles see page 14) Border profile for installation in ceiling joints (max. length 1250 mm) 12/8/1/55 12/8/2/55 12/8/3/55 Border profile for combination with additional profiles 12/8/1/00 12/8/2/00 12/8/3/00 Border profile for covering ceiling joints 12/8/1/88 12/8/2/88 12/8/3/88 Border profile for covering ceiling joints 12/8/1/11 12/8/2/11 12/8/3/11 Border profiles for type 12/M LTG System clean R Border profile for combination with additional profiles 27 41 72 3 12/M/1/00 12/M/2/00 12/M/3/00 Border profile for covering ceiling joints 1,5 27 48 79 1 12/M/1/88 12/M/2/88 12/M/3/88 Border profile for covering ceiling joints 129 Additional profiles for type 12/8 and 12/M, LTG System clean R 12/M/3/11 Additional profile 2 Additional profile 7 (installation adjacent to lamps) 12/8/1/00/22 12/8/1/00/7- Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page of 27
Technicalbrochure Linear air diffusers Type 12/8 and 12/M, LTG System clean - with sound absorber Insertion loss / end reflection factor The cross-talk sound transmission via air ducts between adjacent rooms is a sound flanking path which might reduce the sound insulation of partition walls or suspended ceilings. DIN 49 or customer agreements set minimum sound insulation requirements for partition walls in terms of a weighted sound reduction index R' w. Sound insulation indices may be calculated in terms of a sound pressure level difference with known ceiling surface S and the equivalent absorption surface A of the receiving room: L=R L - lg (S/A) When assessing the sound pressure level difference in the air duct between the source and receiving room, calculation must be in the frequency bands (compare VDI 81, Pages 1, 2, and LTG selection program). Therefore, for cross-talk sound absorbers manufacturers' frequency-dependent insertion loss indices will have to be used. For air diffusers, the insertion loss/end reflection of the air diffusers according to DIN EN ISO 7235 is decisive. The following decision must be made: 1. no cross-talk sound absorber required 2. sound absorber integrated in the air diffuser required 3. additional packaged attenuator of length x required Through loss data of the air diffusers are determined as follows: D t =D i +D td D i air diffuser insertion loss index D td theoretical end reflection at the open end of a straight, solid duct (duct end reflection) from equation B3 in DIN EN ISO 7235 Insertionloss/endreflectionfactorD t Octave [Hz] 12/8/1 D t without sound trap [db] 12/8/2 12/8/3 12/8/4 63 25 22 19 21 125 16 17 14 250 8 6 7 5 500 12 8 8 8 00 12 7 9 7 00 9 5 5 4 4000 6 5 6 5 8000 6 5 4 4 Octave [Hz] 12/8/1 D t with sound trap [db] 12/8/2 12/8/3 12/8/4 63 25 22 19 21 125 16 17 14 250 18 12 11 9 500 22 18 16 00 24 19 13 00 19 12 4000 13 13 11 8000 18 11 11 9 Dimensions air distribution box with sound absorber (melamine resin foam) 132 240 180 132 162 240 180 240 180 240 180 192 40.6 71.6 2.6 134 12/8/1/00 with air distribution box and throttling device DLU 12/8/2/00 with air distribution box and throttling device DLU 12/8/3/00 with air distribution box and throttling device DLU 12/8/4/00 with air distribution box and throttling device DLU Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page 11 of 27
Technicalbrochure Linear air diffusers Type /8 - Selection Selection diagram t [K] -3-6 - a(c max ) c max cmax [cm/s] a(c max )[m] 2 1 /8/1./8/2 with undisturbed air diffusion /8/3 and./8/4 with undisturbed air diffusion 0.5 H= 2.8m - t [K] - -6-3 h= 1.7m H= 2.8m t [K] -8-6 -3 h= 1.7m 40 50 80 0 0 35 25 0 Δp [Pa] 50 40 5 40 80 0 0 0 V[m 3 /(hm)] Legend V = volume flow rate [m 3 /(hm)] t zu = supply air temperature [ C] t RA = room air temperature [ C] Δt = temperature difference between t zu and t RA [K] Δp = pressure drop [Pa] L WA = sound power level [db(a)] a(c max )= extension of jet at which the maximum speed of the ambient air was measured [m] c max = maximum speed of ambient air with uniformly distributed thermal loads [cm/s] h = height of measuring point [m] H = room height [m] The recommended min. distance between two parallel diffusers should, in case of high temperature differences t, not be less than the value of a(c max ). The diagrams are based on measuring results with the standard diffuser element adjustment and a room height of 2.8 m. Example for diagram above Volume flow rate per meter of diffuser: V = 90 m 3 /(hm) Resulting data for type /8/1: Δp = Pa L WA = 28 db(a) Δt = - K a(c max ) 1.4 m c max 18 cm/s Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page 12 of 27
Technicalbrochure Linear air diffusers Type /8 - dimensions Air distribution boxes 61 61 92 123 2 145 * 265 * 250 * 235 * 65 /8/1/00 /8/2/00 /8/3/00 /8/4/00 Air distribution boxes with insulation (doubleskinbox) 91 45 91 45 122 45 3 45 225 64 * /8/1/00 280 67 * /8/2/00 265 67 * /8/3/00 250 67D * /8/4/00 * Execution: integrated throttle damper DLU at spigot diameters 99... 139 The values given refer to standard versions. Reduced box sizes and spigot diameters are available on request, depending on volume flow rate and acoustic requirements. D For the double skin box /8/4 and a spigot diameter of 1, it is 52 mm instead of 67 mm Spigot dimensions DiffuserlengthL nom [mm] 500 750 00 1250 00 1750 00 The given values L WA refer only to the execution without throttle damper resp. with throttle damper open. /8/1, example: 90 m 3 /hm L WA in db(a) out of diagr. p. (ref. to L nom ) 26 28 29 31 31 32 Ø=79mm no. of spigots / 1 / [+1] 2/[0] 2 / [+1] 2 / [+2] 3/[0] 3 / [+2] 4 / [+1] Ø=99mm [correction to diagram in (db)] 1/[0] 1 / [+2] 2/[0] 2 / [+1] 2 / [+1] 2 / [+1] 3 / [+1] Ø = 124 mm standard version highlighted 1/[0] 1/[0] 1 / [+2] 2/[0] 2/[0] 2 / [+2] 2 / [+2] /8/2, example: 0 m 3 /hm L WA in db(a) out of diagr. p. (ref. to L nom ) 27 29 31 32 32 33 Ø=79mm 1 / [+1] 2/[-2] 2/[0] 3/[-2] 3/[-1] 3 / [+1] 4/[-1] Ø=99mm no. of spigots / 1/[-1] 2/[-3] 2/[-2] 2/[-1] 3/[-2] 3/[-1] 3/[-1] [correction to diagram in (db)] Ø = 124 mm 1/[-2] 1/[-2] 1 / [+1] 2/[-2] 2/[-2] 2/[-1] 2/[0] standard version highlighted Ø = 139 mm 1/[-2] 1/[-2] 1/[0] 2/[-2] 2/[-2] 2/[-1] 2/[-1] /8/3, example: 2 m 3 /hm L WA in db(a) out of diagr. p. (ref. to L nom ) 27 29 31 32 32 33 Ø=99mm 1 / [+1] 2/[-4] 2 / [+1] 3/[-2] 3 / [+1] 4/[-1] 4 / [+1] Ø = 124 mm no. of spigots / 1/[-5] 1 / [+2] 2/[-5] 2/[-2] 2 / [+2] 3/[-2] 3/[0] [correction to diagram in (db)] Ø = 139 mm 1/[-6] 1/[-2] 1/[+3] 2/[-4] 2/[-2] 2 / [+1] 3/[-4] standard version highlighted Ø = 9 mm 1/[-7] 1/[-6] 1/[-3] 1/[0] 2/[-6] 2/[-4] 2/[-3] /8/4, example: 2 m 3 /hm L WA in db(a) out of diagr. p. (ref. to L nom ) 27 29 31 32 32 33 Ø = 124 mm no. of spigots / 1 / [+1] 2/[-1] 2 / [+1] 3/[0] 3 / [+1] 4/[0] 4 / [+1] Ø = 139 mm [correction to diagram in (db)] 1/[0] 1 / [+3] 2/[0] 2 / [+1] 3/[-1] 3 / [+1] 4/[0] Ø = 9 mm standard version highlighted 1/[-1] 1/[0] 1 / [+2] 2/[-1] 2/[0] 2 / [+1] 3/[-1] Example: L WA =L WA (out of diagram in page ) + [correction value], /8/2, length = 00 mm, 2 x Ø 99, L WA =db(a)-2db=28db(a) Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page 13 of 27
Technicalbrochure Linear air diffusers Type /8 - additional profiles, border profiles Various border and additional profiles are available for LTG linear diffusers type and LTG System clean R ensuring a perfect integration in and adaptation Additional profiles Additional profile 2 to all kinds of ceiling systems. Thus, both an inconspicuous installation of the diffuser and its use as an interior design element are possible. Profiles may also be used in combination with each other. Additional profile 7 (installation adjacent to lamps) /8/1/00/22 /8/1/00/7- Border profiles Border profile for installation in ceiling joints /8/1/55 /8/2/55 /8/3/55 /8/4/55 Border profile for combination with additional profiles /8/1/00 /8/2/00 /8/3/00 /8/4/00 Border profile for covering ceiling joints /8/1/88 /8/2/88 /8/3/88 /8/4/88 Border profile for covering ceiling joints /8/1/11 /8/2/11 /8/3/11 /8/4/11 Border profile for ceiling panels and adjacent to lamps /8/1/44 /8/2/44 /8/3/44 /8/4/44 Border profile for ceiling panels /8/1/22 /8/2/22 /8/3/22 /8/4/22 Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page 14 of 27
Technicalbrochure Linear air diffusers Type /8 - with sound absorber Insertion loss / end reflection factor The cross-talk sound transmission via air ducts between adjacent rooms is a sound flanking path which might reduce the sound insulation of partition walls or suspended ceilings. DIN 49 or customer agreements set minimum sound insulation requirements for partition walls in terms of a weighted sound reduction index R' w. Sound insulation indices may be calculated in terms of a sound pressure level difference with known ceiling surface S and the equivalent absorption surface A of the receiving room: ΔL=R L - lg (S/A) When assessing the sound pressure level difference in the air duct between the source and receiving room, calculation must be in the frequency bands (compare VDI 81, pages 1, 2, and LTG selection program). Therefore, for cross-talk sound absorbers manufacturers' frequency-dependent insertion loss indices will have to be used. For air diffusers, the insertion loss/end reflection of the air diffusers according to DIN EN ISO 7235 is decisive. The following decision must be made: 1. no cross-talk sound absorber required 2. sound absorber integrated in the air diffuser required 3. additional packaged attenuator of length x required Through loss data of the air diffusers are determined as follows: D t =D i +D td D i air diffuser insertion loss index D td theoretical end reflection at the open end of a straight, solid duct (duct end reflection) from equation B3 in DIN EN ISO 7235 Insertionloss/endreflectionfactorD t Octave [Hz] /8/1 d t without sound trap [db] /8/2 /8/3 /8/4 63 25 22 19 21 125 16 17 14 250 8 6 7 5 500 12 8 8 8 00 12 7 9 7 00 9 5 5 4 4000 6 5 6 5 8000 6 5 4 4 Octave [Hz] /8/1 D t with sound trap [db] /8/2 /8/3 /8/4 63 25 22 19 21 125 16 17 14 250 18 12 11 9 500 22 18 16 00 24 19 13 00 19 12 4000 13 13 11 8000 18 11 11 9 Dimensions air distribution box with sound absorber (melamine resin foam) 132 132 162 192 240 180 ød 240 180 ød 240 180 ød 240 180 ød /8/1/00 with air distribution box and throttling device DLU /8/2/00 with air distribution box and throttling device DLU /8/3/00 with air distribution box and throttling device DLU /8/4/00 with air distribution box and throttling device DLU Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page of 27
Technicalbrochure Linear air diffusers Type 12 and LTG System clean selection Selection diagram t [K] -3-6 - -12 a(c max ) c max c max [cm/s] a(c max ) [m] 2 1 with undisturbed air diffusion 12 with undisturbed air diffusion 0,5 H= 2,8m t [K] -12 - -6-3 h= 1,7m H= 2,8m t [K] -12 - -6-3 h= 1,7m 40 50 80 0 0 35 25 0 p [Pa] 50 40 5 40 80 0... = dimensioning area beyond LTG System clean 0 0 V[m 3 /(hm)] Legend V = volume flow rate [m 3 /(hm)] t zu = supply air temperature [ C] t RA = room air temperature [ C] Δt = temperature difference between t zu and t RA [K] Δp = pressure drop [Pa] L WA = sound power level [db(a)] a(c max )= extension of jet at which the maximum speed of the ambient air was measured [m] c max = maximum speed of ambient air with uniformly distributed thermal loads [cm/s] H = room height [m] h = height of measuring point [m] Note: The recommended min. distance between two parallel diffusers should, in case of high temperature differences Δt, not be less than the value of a (c max ). The diagrams are based on measuring results with the standard diffuser element adjustment and a room height of 2.8 m. Example for diagram above Volume flow rate per meter of diffuser: V = m 3 /(hm) Resulting data for type /-/1: Δp = Pa L WA = 25 db(a) Δt = - K a(c max ) 1 m c max cm/s Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page 16 of 27
Technicalbrochure Linear air diffusers Type 12 - dimensions and accessories border profiles Air distribution box without insulation 96 Air distribution box with insulation (double skin box) 126 45 121 1 12/-/1/00 12/-/1/00 The values given refer to standard versions. Reduced box sizes and spigot diameters are available on request, depending on volume flow rate and acoustic requirements. *) Neck lengths 45 to 80 mm Special dimensions on request. Spigot dimensions Diffuser length L nom [mm]* 500 750 00 1250 12 Ø d [mm] 1x99 1x99 1x99 2x99 Border profiles (length max. 1250 mm) 12/-/1/00 Profile for inconspicuous installation in shaded joints 12/-/1/11 Profile for covering ceiling joints 12/-/1/ Profile for lamps, suitable for lamp borders of 6...7 mm Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page 17 of 27
Technicalbrochure Linear air diffusers Type LTG System clean R - dimensions, border profiles Air distribution box without insulation 96 Air distribution box with insulation (double skin box) 126 45 12 1 1 /0/1/00 /0/1/00 The values given refer to standard versions. Reduced box sizes and spigot diameters are available on request, depending on volume flow rate and acoustic requirements. *) Neck lengths 45... 80 mm Spigot dimensions Length of diffuser L Nom [mm]* 500 750 00 1250 00 1750 00 Ø d [mm] 1x99 1x99 1x99 2x99 2x99 2x99 2x99 Border profiles /0/1/00 Profile for inconspicuous installation in shaded joints /1/1/11 Profile for covering ceiling joints /0/1/ Profile for lamps, suitable for lamp borders of 6...7 mm Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page 18 of 27
Technicalbrochure Linear air diffusers Type 50 - selection Selection diagram t [K] -4-6 - a(c max ) c max a(c max )[m] c max [cm/s] 5 4 3 50/-/1 2 1.5 t [K] - -6 with undisturbed air diffusion 1 H= 5m h= 1.7m t [K] 50/-/3-6 -4 H= 5m -8-6 50/-/2 with undisturbed air diffusion h= 1.7m 0 0 0 400 0 800 25 35 45 40 Δp [Pa] 50 40 5 a min [m] 5 4 3 2 1,5 1 0 0 0 400 0 800 V[m 3 /(hm)] Legend V = volume flow rate [m 3 /(hm)] t zu = supply air temperature [ C] t RA = room air temperature [ C] Δt = temperature difference between t zu and t RA [K] Δp = pressure drop [Pa] L WA = sound power level [db(a)] a(c max )= extension of jet at which the maximum speed of the ambient air was measured [m] c max = maximum speed of ambient air with uniformly distributed thermal loads [cm/s] H = room height [m] h = height of measuring point [m] Note: The recommended min. distance between two parallel diffusers should, in case of high temperature differences Δt, not be less than the value of a (c max ). The diagrams are based on measuring results with the standard diffuser element adjustment, a room height of 5 m and a uniform load distribution. For an optimized air flow, an adaptation may be required according to project. Example for diagram above Volume flow rate per meter of diffuser: V = 3 m 3 /(hm) Resulting data for type 50/-/1: Δp = 26 Pa L WA = 41 db(a) Δt = - K a(c max ) 4.4 m c max 24 cm/s Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page 19 of 27
Technicalbrochure Linear air diffusers Type 50 - dimensions, additional profile Dimensions of air distribution boxes 1 1 321 241 241 241 50/ /1/00 50/ /2/00 50/ 3/00 Dimensions of air distribution boxes with insulation (double skin box) 231 1 45 231 1 45 351 321 45 326 241 326 241 326 241 50/ /1/00 50/ /2/00 50/ /3/00 The values given refer to standard versions. Reduced box sizes and spigot diameters are available on request, depending on volume flow rate and acoustic requirements. *) Neck length 70... 170 mm Spigot dimensions Diffuser length 50/-/1 (1 slot row) 50/-/2 (2 slot rows) 50/-/3 (3 slot rows) L nom [mm]* 0 0 900 00 1800 20 1x 1x 1x 1x 1x 1x 2x 2x 2x 2x 2x 2x 3x 3x 3x 3x 3x 3x 3x 4x 4x *) We recommend to choose large spigot and duct diameters to obtain the lowest possible duct speed as this will result in lower pressure losses and less noise caused by the flow. Due to an improved air distribution, the system can do without some of the additional units usually required such as throttle valves. Additional profile Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page of 27
Technicalbrochure Linear air diffusers Installation Distance between parallel linear diffusers and to walls An unfavorable arrangement of linear diffusers in parallel lines or close to walls may result in air flow speeds higher than those given in the technical specifications. In order to avoid this problem: - ensure that the distance between parallel linear diffusers is sufficiently large to exclude any interaction, - ensure that air jets are mixed above the occupied zone (e.g. at a height of 1.8 m). Based on these requirements, the two areas marked in Figure 1 are obtained indicating the recommended distance b between parallel linear diffusers. For an installation parallel to walls, at least half the distance (b/2) is required. Distance b [m] 6 5 4 3 2 1 0 b/2 b 0 0.5 1 1.5 2 2.5 3 3.5 4 Jet penetration depth a(c max )[m] Figure 1: Distance between parallel diffusers with a symmetric air flow pattern Example From the selection diagram: a(c max )=1.1m Recommended distance betw. parallel diffusers: 1.1 m < b < 1.9 m or b>2.9m recommended distance tothewall: b/2>0.55m All linear diffusers also allow an asymmetric splitting of the air volume in a 1/3 to 2/3 ratio. The recommended distances b 1/3 and b 2/3 between parallel diffusers are illustrated in Figure 2. For the jet penetration depth a(c max ) refer to the selection diagrams for a symmetric distribution. Distance b2/3 [m] 8 6 4 2 0 Distanceb1/3 [m] 5 4 3 2 1 b 1/3 /2 b 2/3 b 1/3 b 2/3 /2 0 0 0.5 1 1.5 2 2.5 3 Jet penetration depth a(c max )[m] Figure 2: Distance between parallel diffusers with an asymmetric air flow pattern (1/3 to 2/3). Example From the selection diagram: a(c max )=1.1m Recommended distance between parallel diffusers: 1/3-share: 0.8 m < b 1/3 <1.4mor b 1/3 >2.4m 2/3-share: 1.6 m < b 2/3 <2.8mor b 2/3 >4.8m Recommended distance to the wall: 1/3-share: b 1/3 /2>0.4m 2/3-share: b 2/3 /2>0.8m Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page 21 of 27
Technicalbrochure Linear air diffusers Accessories - throttling device type DLU Pressure drop and acoustic level DLU Ø 99 90 Additional static pressure drop [Pa] 0 0 80 40 8 6 4 25 35 40 75 45 2 40 80 0 1 140 1 1800 Flow rate [m 3 /h] Pressure drop and acoustic level DLU Ø 124 Additional static pressure drop [Pa] 0 0 80 40 8 6 4 25 35 40 90 75 45 The throttle damper type DLU consists of a damper blade out of galvanizes steel sheet, integrated in the air distribution box. It is adjustable through the diffuser. For an acoustic dimensioning, the sound sources must be summed logarithmically when using throttling devices in combination with linear diffusers. 2 80 0 1 140 1 180 0 2240 Flow rate [m 3 /h] Pressure drop and acoustic level DLU Ø 139 Additional static pressure drop [Pa] 0 0 80 40 8 6 4 25 35 40 90 75 45 2 80 0 1 140 1 180 0 2 240 Flow rate [m 3 /h] Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page 22 of 27
Technicalbrochure Linear air diffusers Accessories - throttling devices type KLA and KLU 2 61 41 2xd* 2 * other dimensions on request 61 41 2xd* The throttling damper type KLA and KLU are manually adjustable devices for connection to the air distribution box. The damper blades are made of perforated plate available with various free areas to suit throttling requirements. Type KLA is adjustable from outside the duct on the pivot spindle. Type KLU is adjustable through the diffuser. For an acoustic dimensioning, the sound sources must be summed logarithmically when using throttling devices in combination with linear diffusers. Type KLA, adjustable from outside the duct Type KLU, adjustable through the diffuser Pressure drop and acoustic level KLA, KLU 0 40 90 /55 0 35 /40 Additional static pressure drop [Pa] 50 5 25 45 / / 2 0.3 0.5 1 1.5 2 3 4 5 Air velocity within spigot [m/s] 99 Ø d 124 Ø d 139 Ø d 9 Ø d 40 50 70 80 0 1 +2dB 40 50 70 80 0 1 1 0 +3dB 40 50 80 0 1 1 0 250 +4dB 40 50 80 0 125 0 0 0 350 +6dB 40 80 0 125 0 0 250 0 400 550 Sound power level +/- 3 db Flow rate [ m 3 /h] Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page 23 of 27
Technical brochure Linear air diffusers Accessories for installation of lamps LTG has developed special border profiles for the application of linear diffusers in combination with lamps. A wide variety of lamp brands and styles can be used with the linear diffusers. The installation of the diffuser is performed by screw connections. In order to make the installation even easier, the components are standard, which means that no drilling or adjusting of the linear diffusers will be required to fit the lamps. Alternatively, the lamps may be integrated in the air distribution box by using a lamp rail. LTG linear diffusers type 12/8/2/12 with a lamp rail integrated in the air distribution box. Example for lamp installation using 12/ /1/ Example for lamp installation, suitable for the following linear diffuser types: 12/-/1/ /0/1/ 12/8/1/40/-7 /8/1/40/-7 Example for lamp installation using 12/8/1/40/-7 Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page 24 of 27
Technicalbrochure Linear air diffusers Accessories for suspension Ø5 Example for installation of type 12/8/1/00 with air distribution box and subsequently second fix installed slotted rail Example for installation of type /8/1/00 with air distribution box and continuously adjustable spring hanger (adjusting range about 3/4 of the length of the hooked wire) Example for installation of type /8/2/00 with air distribution box without insulation. The four suspension eyes are included in the delivery of the narrow box. 114 62 Ø7 oblong holes 12.5 x 5 17 43 57 50 31 90 111 1 41 Example for installation of type /8/3/11 with fixing brackets for blind attachment Example for installation of type /8/1/00 with suspension bracket for blind attachment Example for installation of blind profiles type Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page 25 of 27
Technicalbrochure Linear air diffusers Accessories for installation End caps By using end caps, a closed frame of linear diffusers is obtained. 17 25* 67 1.5 41 41 Example: /8/1/11 with end cup Example: /8/1/00 with support bracket Example: /8/1/00 with end plate 12/8 and /8: 4.5 mm 50: 6 mm 17 4 : or 25 mm* 50: mm Adjustable height as required 2 3 * mm for border profile 8. 25mm for border profile 1 Connecting piece A flush mounting of the diffusers is achieved by using connecting pieces inserted in the guiding grooves of the profiles. Several linear diffusers may thus be connected to form a continuous line. For linear diffusers with additional profiles, a flush mounting is achieved by using additional overlap profiles or connecting pins. Angle Angles offer a perfect solution for the continuous installation of linear diffusers. L ±0,5 L ±0,5 Connecting pin when using additional profiles Connecting piece (not possible when using additional profiles) Angle, L min = 250 mm Displacement in height ± 0.5 mm Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page 26 of 27
Technicalbrochure Linear air diffusers Nomenclature, ordering code /8 / 1 / 00 / 1 / E6 EV1 / 00 / S / S / EWB / S / / SDA / O / B / M (1) (2) (3) (4) (5) (6) (7) (8) (9) () (11) (12) (13) (14) () (16) (1) Diffuser type 12/ = 12/ 12/8 = 12/8 12/M = 12/M /8 = /8 = 50 = 50 (2) Number of slots 1...4 =1 4slots 12 / only 1 slot, 12/M only 1 3 slots (3) Design border profile 0...8 = Left - right (4) Design additional profile =Without 1, 7 =Left-right (5) Surface additional profile E6 = Anodized, unbrushed LG = Painted, glossy LM = Painted, mat R = Unfinished X = Special finish B = Coated (6) Colour border profile... = RAL-shade = painted... = Anodizing shade = anodized (7) Diffuser length... = Diffuserlengthinmm (8) Flow pattern S12 = 2R2L,... (for 12/, 12/8, 12/M) S = 3R3L,... S = 3R3L3R, 3L3R3L,... S50 = 3R3L,... SX =... (special version) (9) Diffuser element colour S = RAL 9011 graphite black W = RAL 90 pure white G = RAL 9007 grey aluminium X = RAL... (special colour, indicate RAL-shade) () End caps =Without EWB = End caps both sides EWR =Endcapsrightside EWL = End caps left side EPB = End plat both sides EPR = End plate right side EPL =Endplateleftside (11) Plenum box type = Without S = Standard plenum box D = Double skin plenum box X = Special plenum box W = Angle (12) Sound absorber = Without sound absorber S =Withsoundabsorber (13) Connection type = Without SDA = Spigot only DLU = Throttling device DLU KLA = Throttling device KLA KLU = Throttling device KLU (14) Diffuser element type O =Open B =Blind () Suspension for dummy O = Without diffuser installation B = Suspension brackets DB = Double dummy brackets (16) Second fix O = Without Second Fix fixing M = With Second Fix fixing Note: Not all combinations are practicable. In individual cases please contact LTG. 1.Dient zur Identifizierung der letzten Seite Grenzstraße 7 70435 Stuttgart Germany -eng-tp (/14) Former editions are invalid Subject to technical modifications page 27 of 27
Product Overview LTG Air Diffusers LTG air diffusers for ceiling, wall or floor Ceiling Wall Floor Linear diffuser LWmodule LDU LTG System clean LWmodule LTG System clean LDU-W Swirldiffuser Transfer air device DLA LDO- T Custom diffusers LDR and 12M LTG System clean Step diffuser BLQ Displacement air diffuser DLD Displacement air diffuser DLQ Engineering Services LTG Engineering Services Comfort Air Technology
AIR TECH SYSTEMS Comfort Air Technology Air-Water Systems Air Diffusers Air Distribution Process Air Technology Fans Filtration technology Humidification Technology Engineering Services Laboratory Test / Experiment Field Measurement / Optimisation Simulation / Analysis R&D / Start-up Grenzstraße 7 70435 Stuttgart Germany Tel.: +49 711 81-0 Fax: +49 711 81-7 info@ltg.de www.ltg.net LTG Incorporated 5 Corporate Drive, Suite E Spartanburg, SC 293 USA Tel..: +1 864 599-6340 Fax: +1 864 599-6344 info@ltg-inc.net www.ltg-inc.net -eng-tp (08/) 419-16 E Former editions are invalid Subject to technical modifications