VAV-PRC008-EN D 1 Introduction D 2 – 3 Linear Slot Diffusers (LINR) D 4 – 11 Adjustable Flow Diffusers (FAPF, VAPF, AABD, VAPS) D 12 – 21 Light Fixture Diffusers (LITE) D 22 – 26 Induction Diffusers (INDT, INDB, INCB, INSR) D 27 – 29 Perforated Diffusers (PERF) D 30 – 32 Mechanical Specifications D 33 – 34 Introduction In today’s diverse building environment, we are seeing an expanding role of VAV applications across many different market segments. While this is happening, it is necessary to make sure the VAV systems and diffusers in particular are applied, installed, and operated correctly. The purpose of this section of the catalog is to show these issues that need to be considered when selecting and placing diffusers. DIFFUSER PLENUM (OPTIONAL) CONTROL UNIT Table of Contents Diffusers
34
Embed
Diffusers Table of Contents - TraneSlot Diffusers Diffuser Placement – The maximum recommended distance between diffusers is three diffuser lengths. For example, if the diffuser
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Induction Diffusers (INDT, INDB, INCB, INSR) D 27 – 29
Perforated Diffusers (PERF) D 30 – 32
Mechanical Specifications D 33 – 34
IntroductionIn today’s diverse buildingenvironment, we are seeing anexpanding role of VAV applicationsacross many different marketsegments. While this is happening,it is necessary to make sure the VAVsystems and diffusers in particularare applied, installed, and operatedcorrectly.
The purpose of this section of thecatalog is to show these issues thatneed to be considered when selectingand placing diffusers.
DIFFUSER
PLENUM(OPTIONAL)
CONTROLUNIT
Table ofContents
Diffusers
D 2 VAV-PRC008-EN
DiffusersThe VariTrane line of variable-air-volume (VAV) products has been anindustry leader in performance andquality for many years. While mostwould associate the VariTrane namewith VAV terminal units, the diffuserproduct line has grown significantlyover the years.
Room Air DistributionWhen variable-flow cooling andconstant-flow heating are combined ina zone, the zone air diffusers areusually selected at partial cooling loadto ensure proper operation. Ceiling-mounted linear slot diffusers arerecommended since they perform wellover a wide range of velocities. Cool airdelivery takes advantage of the“Coanda” effect, whereby cool airdischarged through a linear slotdiffuser hugs the ceiling beforedescending, insuring proper operationover a wide range of flows without“dumping.” When delivering warm airwith constant flow velocities, or warm/cool air with variable flow velocities,the flow velocity must be high enoughto ensure that the air reaches the floor.To prevent stratification, the warm airtemperature should not be more than20°F (6.7°C) above the zone airtemperature.
In addition to choosing the correctdiffuser type, the designer mustproperly size and place each diffuser inthe zone to minimize noise andpressure drop while maximizing thethrow and diffusion performance.
VariTrane Diffuser TypesThe VariTrane line of diffusers containsa variety of different models. Thefollowing is a list of the diffuser types
in the VariTrane line,an explanation ofeach type, and a shortdiscussion of theproper application foreach type.
Linear Slot Diffuser(LINR)Linear slot diffusersare most commonlyused in VAV systems.
SUPPLSUPPLYAIR DIFFUSERSAIR DIFFUSERS
RETURNRETURNAIRAIRDIFFUSERDIFFUSER
NEVER DO NEVER DO THIS!!THIS!!(PERPENDICULAR AIR FLOWS)
nominal airflow. If you start by using100% of the nominal airflow, you willend up with high losses inperformance, acoustical problems, andvery little or no design flexibility.
A diffuser airflow rate is 50 cfm perlinear foot (77.4 L/s per linear meter) ofdiffuser. Therefore, the recommendedflow to use when designing is 50 cfm/linear ft x 0.8 = 40 cfm/linear ft (77.4 L/s/linear m x 0.8 = 61.9 L/s/linear m).
The nominal airflow of a diffuser isdetermined by multiplying the diffuserlength, the number of slots, and theairflow per linear foot. Using theairflow per linear foot calculated above,a 4 foot, 2-slot, 2-way diffuser shouldbe designed to handle 4 linear ft x 2slots x 40 cfm/linear ft = 320 cfm(1.219 m x 2 slots x 61.9 L/s/linear m =150.9 L/s).
To maximize the effectiveness ofventilation with ceiling diffusers,throws should be kept as long aspossible. For proper air circulation, tryto maintain at least a 20°F (6.7°C)difference between the supply air androom temperature. This provides foroptimum performance.
Collision Velocities –The collisionvelocity is the speed at which movingair meets a wall or another airflow
This type of diffuser has a fixed vaneinside, which means that the pattern isnot adjustable. The fixed vane allows awide range of flows through thediffuser without causing drafts. Lowerflanges provide ceiling tile support asan integral part of the diffuser housing.
Recommended Guidelines—LinearSlot DiffusersDiffuser Placement – The maximumrecommended distance betweendiffusers is three diffuser lengths. Forexample, if the diffuser length is 4 feet(1.219 m), the maximum separationdistance would be 4 ft x 3 = 12ft(1.219 m x 3 = 3.658 m).
The maximum recommended distancefor diffusers from an exterior wall, withparallel flow to the wall is two diffuserlengths. For example, if the diffuserlength is 4 feet (1.219 m), themaximum distance from the exteriorwall would be 4 ft x 2 = 8 ft(1.219 m x 2 = 2.438 m).
A simple rule for better air circulation isto avoid placing supply air linear slotdiffusers that allow airflows to collideat right angles.
General Guidelines – Whenbeginning the placement and layout ofdiffusers, assume that each diffuserdelivers only 75% to 80% of its
Diffusers Introduction
VAV-PRC008-EN D 3
INTERIOR INTERIOR WALLALL 75 FPM75 FPMMAX.MAX.
150 FPM150 FPMMAX.MAX.
150 FPM150 FPMMAX.MAX.EXTERIOR EXTERIOR WALLALL
stream. For exterior walls, the collisionvelocity should be between 100 and150 feet per minute (FPM) (0.508 and0.762 m/s). Do not exceed 150 FPM(0.762 m/s) on an exterior wall. Forinterior walls, the collision velocityshould be between 50 and 75 FPM(0.254 and 0.381 m/s). Try not to exceed75 FPM (0.381 m/s) for interior walls.The maximum recommended collisionvelocity between airflow streamsshould not exceed 150 FPM (0.762m/s). The collision velocity betweenairflow streams is determined by theaddition of both velocities at the pointof collision. Avoid collision of airvelocities at right angles to each otherby trying to maintain parallel flow.Following this guideline will allow oneto maximize the "Coanda" effect andproper air diffusion in a zone.Experience indicates that mixed airafter collision near the ceiling andbelow 150 FPM will produce comfort inthe zone at the occupant's level.
Return Air Slots – Return air slotsare placed perpendicular to supply airslots. This prevents supply air frombypassing the space, and allows forproper air circulation. With asuspended ceiling, low operating staticpressure across the ceiling panels mustbe maintained. Failure to do so willcause the return air to be forcedaround the edges of the ceiling panels.When this happens, soiling of thepanels will occur and the mechanicalsystem can become choked for returnair. A space-to-plenum pressure dropof 0.02 to 0.03 inches of water isacceptable under most conditions.
RETURNRETURNDIFFUSERDIFFUSERSLOSLOT
SUPPLSUPPLYDIFFUSERDIFFUSER
PERPENDICULARPERPENDICULAR
Fully Adjustable Pattern Flow (FAPF) –The FAPF diffuser, a type of ceilingdiffuser outlet, should be used with lay-in ceilings. The primary benefit of thiskind of diffuser is that it provides themost flexibility of adjustment of theairflow pattern. The FAPF diffuserprovides adjustable vanes forhorizontal or vertical throw. The dual-vane option allows each slot to beadjusted for left, right, or vertical throw.Besides pattern adjustments, the vanesalso provide airflow dampering. Inaddition, the vanes are adjustable fromthe face of the diffuser so changes tothe pattern can be made after thediffuser is installed.
Vane Adjustable Pattern Flow (VAPF) –The VAPF diffuser is very similar to theFAPF ceiling outlet diffusers. Theprimary difference is the design of thepattern adjustment vane. The VAPFdiffuser should be used with lay-inceilings. The pattern is adjustable forhorizontal left, horizontal right, orvertical throw. The pattern adjustmentvane contains a felt seal on the end toreduce air leakage around the vane.The vanes are adjustable from the faceof the diffuser, allowing the pattern tobe easily changed after installation.
Vane Adjustable Pattern Flow–Special (VAPS) –The VAPS diffuser is a special versionof the VAPF diffuser. The design of thevane is slightly different from the VAPFmodel, but the VAPS has the samefunctionality. The VAPS has beenpopular in certain regions of thecountry.
Adjustable Air Bar Diffuser (AABD) –The AABD diffuser is another lay-inceiling type of diffuser. The differencebetween the AABD and the FAPF or theVAPF is that the AABD has noadjustment vane. A sliding air bar inthe outlet of the diffuser makes thepattern adjustments. The pattern isadjustable for horizontal left, horizontalright, or vertical throw.
Light Fixture Diffuser (LITE) –The LITE diffuser should be installedon a suspended ceiling light fixture.This type of diffuser is quite popularwith architects, because the number ofceiling penetrations can be reduced.The diffuser is available with anintegral sliding volume damper andwith or without pattern control vanes(some light fixtures already containpattern control vanes). Both thevolume damper and the patterncontrol vanes (if necessary) are
adjustable with a screwdriver from theface of the diffuser without removingthe light fixture doorframe. The patterncontrol vane allows for eitherhorizontal or vertical throw.
Induction Diffusers (INDT, INDB, INSR,INCB)—Induction diffuser discharges air in atight pattern along a ceiling. Thedischarged air then induces the roomair into the air stream to effectively mixthe streams. Induction diffusers aretypically used in exterior zones thathave unusually high heat loads ordrafts. They are designed to beinstalled in suspended ceilings andhave high induction horizontal airflow.The center down blow option providesa vertical air pattern for exterior wallsor glass. Induction diffusers haveadjustable blades for volume anddirection control.
INDT –This type of induction diffusercontains a supply air outlet only. It willproject air along a ceiling and providemixing of the primary and room airstreams.
INDT –This type of induction diffusercontains a standard supply air outletalong with down blow outlet. Thedown blow outlet will project a jet ofprimary air in a vertical direction whilethe standard outlet projects theinduction jet. The down blow jet isoften washed along an exterior glasswindow or aimed to combatsomething that is producing a draft inthe space.
INSR –This type of induction diffusercontains a supply air outlet along witha separate return air inlet integratedinto one device. This reduces thenumber of ceiling penetrationsnecessary.
INCB – This type of induction diffusercontains a standard supply air outlet, adown blow outlet, and a separatereturn air inlet integrated into onedevice.
Perforated Diffuser (PERF)The PERF diffusers are designed foruse with lay-in ceilings and provide themost economical option for airdiffusion. The pre-assembled diffuser ismade to lay in a 24" x 24"(0.610 m x 0.610 m) ceiling openingand is available with multiple roundinlet connection sizes. Outlets areavailable with disc or adjustabledeflector. The air is projected in acircular pattern from the diffuser.
Diffusers Introduction
D 4 VAV-PRC008-EN
Linear Slot DiffusersThe features of the Linear Slot Diffuserare described by the productcategories shown in bold. Within eachcategory the options available arelisted.
TSP - Static pressure readings in in. wg.Throw - Horizontal distance in feet to reach terminal velocity, VT, of 50 FPM.Throw 1 and Throw 2 indicates number of slots throwing each direction on 3-slot, 2-way diffuser.NC - A one number evaluation of sound generation derived from sound power levels (re: 10-12 watts) less 10 db room absorption. (20) indicates less than 20 NC rating.Data shown is for one diffuser. Additional diffusers will tend to increase the NC value by perhaps 2 db each, depending on size, air quantity and distance from otherdiffusers. Return applications will add +2 db to all values shown. Performance data is based on tests performed in accordance with ADC 1062 GRD-84 Test Code.
33 3-slot – 1-way34 3-slot – 2-way left or right43 1-slot – 2-way opposite44 4-slot – 2-way opposite left
or right
Adjustable Flow DiffusersThe features of the Adjustable FlowDiffuser are described by the productcategories shown in bold. Within eachcategory the options available arelisted.
MODL ModelVLSD Supply DiffuserVLRD Return
DSEQ Design SequenceA A Design Sequence
TYPE Diffuser TypeFAPF Fully Adjustable Pattern FlowDiffuserVAPF Vane Adjustable Pattern FlowDiffuserAABD Adjustable Air Bar DiffuserVAPS Vane Adjustable Pattern FlowDiffuser
NC (20) (20) (20) 28 34 40TSP - Total pressure readings in in. wg with horizontal throw.Ak - Area factor along with cfm is used to determine theaverage face velocity - Vk = cfm / AkThrow - Horizontal distance in feet to reach terminal velocity,VT, of 50 FPM.NC - A one number evaluation of sound generation derivedfrom sound power levels ( re: 10-12 watts) less 10 db roomabsorption. (20) indicates less than 20 NC rating. Data shown isfor one diffuser. Additional diffusers will tend to increase theNC value by perhaps 2 db each, depending on size, air quantityand distance from other diffusers. Return applications will add+2 db to all values shown. Peformance data is based on testsperformed in accordance with ADC 1062 GRD-84 Test Code.
2. Neck opening is located so that the bottom of inlet is above air pattern
Notes:
LENGTH
Length
10" OVAL8"
6"7"
10" OVAL8"
6"7"
INLET
3
Open Return
1316
161
2
163
13
1 316
Supply Diffuser
161
2
16
1613
3
13
7
78
81
1
InletDiameter
21
12
60" (59-3/4")48" (47-3/4")
36" (35-3/4")24" (23-3/4")
58463422
"""
"
"
"
"
"
"
"
Inlet Damper (Optional)
notched grid ceilings.3. VAPS diffusers are only available for 15/16" T-Bar and 15/16" center
Insulation
4. All dimensions are in inches.
"
"
"
"
"
"
Diffusers—AdjustableFlow
D 16 VAV-PRC008-EN
DimensionalData—FAPF
23"
4 44
3+
B
12
2
34
1
FAPF 1 and 2 SLOT
STYLES:STYLES:ONE SLOT
11 12 13 14 15 16 21 22 23 24 25 26 27 28 29
TWO SLOT
ONE SLOT RETURN TWO SLOT RETURN
ONE SLOT TWO SLOT
SLOT WIDTH A
OVERALL WIDTH B
OUTLET HEIGHT D 1"
1" 1
11"
1"1"
1"1
1" 1"
1
1 1
1"1"
1"1
1"
1"
1"1
1"
1"1"
1"
1"
1
2 22
2
2
2
2 21"1 2"
2" 2
3
3"
3"
3"
3"
3"
3"
3"33 4
4
4
4
4 4
4
4
4
2
4 54
4
12
DD
+
BB
A A
INLETDIAMETER
21 B + 1
INSULATION
A
B
122
A
B
T-CLIPS(OPTIONAL)
DAMPERS(OPTIONAL)
NOMINAL LENGTH - ¼
NOMINAL LENGTH
1
HEIGHT
6"
8"
10"
LOW - 9.5"
MED - 11.5"
HIGH - 13.5""
SLOT WIDTH A
OVERALL WIDTH B
ONE SLOT SUPPLY
ONE SLOT
TWO SLOT SUPPLY
TWO SLOT1"
1"
1"1"1"
1"
1"
1"
1"1"1"
1"1"2 2"
2 2
2
23"
3" 3 3"
3"
3 3" 3"4 4
44
4
4 4
4 44
4 41 1 1
1 1 1
5
NOTES:
1. ADJUSTABLE VANES FOR HORIZONTAL OR VERTICAL THROW. DUAL VANE OPTION ALLOWS EACH SLOT TO BE ADJUSTED FOR LEFT, RIGHT OR VERTICAL THROW AND DAMPERING.
2. DIFFUSERS OVER 36" LONG HAVE VANES MADE IN TWO SEPARATE PIECES TO ALLOW SPLITTING AIR FLOW SETTINGS WITHIN EACH SLOT.
3. AVAILABLE IN NOMINAL LENGTHS FROM 2', 3', 4', AND 5'.
4. MATERIAL: 24-GAGE GALVANNEALED STEEL.
5. ALL EXPOSED SURFACES PAINTED FLAT BLACK. FACTORY- INSTALLED T-BARS ARE WHITE.
6. ALL DIMENSIONS ARE IN INCHES.
INLETDIA +3
Diffusers—AdjustableFlow
VAV-PRC008-EN D 17
DimensionalData—FAPF
PATTERN CONFIGURATIONS
NOTES:
1. AVAILABLE IN NOMINAL LENGTHS FROM 2 TO 5 FEET.
2. MATERIAL: 24-GAGE GALVANNEALED STEEL.
3. ALL EXPOSED SURFACES PAINTED FLAT BLACK. FACTORY-INSTALLED T-BARS ARE WHITE.
4. ALL DIMENSIONS ARE IN INCHES.
SINGLE VANES ALLOW EACH SLOT TOTHROW IN ONE HORIZONTAL DIRECTIONOR VERTICAL. SPECIFY THE NUMBER OFSLOTS TO THROW IN EACH DIRECTION.EX:
DUAL VANES ALLOW EACH SLOT TO BEADJUSTED FOR RIGHT, LEFT OR VERTICALTHROW. (STYL 34)
TSP - Total pressure readings in in. wg with horizontal throw.Throw - Horizontal distance in feet to reach terminal velocity, VT, of 50 FPM.NC - A one number evaluation of sound generation derived from sound power levels ( re:10-12 watts) less 8 db room absorption. (20) indicates less than 20 NC rating. Data shownis for one diffuser. Additional diffusers will tend to increase the NC value by perhaps 2 dbeach, depending on size, air quantity and distance from other diffusers. Returnapplications will add +2 db to all values shown. Performance data is based on testsperformed in accordance with ADC 1062 GRD-84 Test Code.
Style FAPF Diffuser Performance (con't.)
D 20 VAV-PRC008-EN
DimensionalData—AABD
AABD
INLETDIA + 3½
NOMINAL LENGTH INTERNAL INSULATION
1½INLET DAMPER(OPTIONAL)
T-BARS BY OTHERS
B
AA
B
½2½
T-CLIPS(OPTIONAL)
ONE SLOT TWO SLOTSLOT WIDTH A
OVERALL WIDTH B3 33
333
3
33
3
31 1
11
1
1
1111
11
111
4
44
4 4
44
44
4
4 4222
22
2
8
NOTES:1. SLIDING AIR BAR PROVIDES LEFT, RIGHT, OR VERTICAL THROW.
2. DIFFUSERS OVER 36" IN LENGTH HAVE TWO AIR BARS PER SLOT TO ALLOW SPLIT AIR PATTERNS.
3. AVAILABLE IN NOMINAL LENGTHS FROM 2' TO 5'. NORMAL T-BAR APPLICATION IS NORMAL LENGTH LESS ¼".
4. MATERIAL: 24-GAGE GALVANNEALED STEEL. ALL EXPOSED SURFACES PAINTED BLACK.
5. ONLY AVAILABLE FOR 15/16" T-BAR AND CENTER NOTCHED GRID (2X2T) CEILING ONLY.
6. ALL DIMENSIONS ARE IN INCHES.– – –––––––
––– –– –
INLETDIAMETER HEIGHT
6"
8"
10"
LOW – 9.5"
MED – 11.5"
HIGH – 13.5"
5
Diffusers—AdjustableFlow
VAV-PRC008-EN D 21
PerformanceData—AABD
TSP - Static pressure readings in in. wg.Throw - Horizontal distance in feet to reach terminal velocity, VT, of 50 FPM.NC - A one number evaluation of sound generation derived from sound power levels ( re: 10-12 watts) less 10db room absorption. (20) indicates less than 20 NC rating. Data shown is for one diffuser. Additional diffuserswill tend to increase the NC value by perhaps 2 db each, depending on size, air quantity and distance fromother diffusers. Return applications will add +2 db to all values shown. Peformance data is based on testsperformed in accordance with ADC 1062 GRD-84 Test Code.
INLT Inlet Size And LocationS5 5” Side InletS6 6” Side InletT5 5” Top InletT6 6” Top InletT7 7” Top InletT8 8” Top Inlet
INSL InsulationNONE No Insulation On DiffuserINT Matte-Faced – Internally
InsulatedEXT Foil-Faced – Externally
Insulated
Diffusers—LightFixture
VAV-PRC008-EN D 23
DimensionalData—VLSD–SNGL
VLSD – SNGL
634
LINTERNAL INSULATION(OPTIONAL)
VOLUME DAMPERACCESSIBLE THROUGHAIR SLOT - 4' MODELSHAVE TWO INDIVIDUALDAMPERS
AIR PATTERN BAROMITTED WHEN LIGHTFIXTURE RAIL IS FURNISHEDWITH DEFLECTOR
HOLD-DOWN TABS TOALIGN AND LOCK DIFFUSERTO LIGHT FIXTURE AIR SLOT(SHIPPED FLAT)
3
1316 112
MOUNTINGBRACKET
INSULATIONNONE - STEEL UNINSULATED
INT - STEEL WITH 1/2" FOIL FACED EXTERNAL INSULATION
EXT - STEEL WITH 1/2" FOIL FACED EXTERNAL INSULATION
INSL - NONE INSL - INT INSL - EXT
1 116
134
58
18
834
DIFFUSERLENGTH
AIRDIFFUSERLENGTH
2
3
4
20"
27"
40"
INLET
S5 - 5" SIDE INLET
S6 - 6" SIDE INLET
NOTES:1. DIFFUSERS ARE AVAILABLE AS SUPPLY UNITS FOR REGRESSED OR FLUSH AIR HANDLING LIGHT DIFFUSERS.
2. MATERIAL: GALVANNEALED STEEL. EXPOSED SLOT AREA PAINTED FLAT BLACK.
3. HEIGHT: 6¾" STANDARD. CEILING CLEARANCE REQUIRED IS 7" PLUS AMOUNT LIGHT IS REGRESSED ABOVE CEILING LINE. (FOR SINGLE SIDE ONLY)
4. INLETS: 5" OR 6" OVAL STANDARD ON SIDE ENTRY.
5. ALL SUPPLY DIFFUSERS INCLUDE PLENUM, INSULATION (WHEN SPECIFIED) AND DUCT CONNECTION.
6. INSULATION IS U.L. LISTED AND MEETS NFPA 90A AND U.L. 181.
7. STANDARD DIFFUSER LENGTHS ARE STATED. ACTUAL LENGTH WILL VARY WITH LIGHT MANUFACTURER. TO INSURE COMPATIBILITY, LIST LIGHT MANUFACTURER AND MODEL NUMBER.
8. ALL DIMENSIONS ARE IN INCHES.
4 78
1
Diffusers—LightFixture
D 24 VAV-PRC008-EN
DimensionalData—VLSD–DUAL
Diffusers—LightFixture
VLSD – DUAL
VAV-PRC008-EN D 25
DimensionalData—VRLD–SNGL
VRLD – SNGL OPEN RETURNSMOUNTINGBRACKET(SHIPPED FLAT)
3 12
LENGTH
INSULATIONNONE - STEEL UNINSULATED
INT - STEEL WITH ½" INTERNAL MATTE FACED INSULATION
INSL - NONE
INTERNAL INSULATION(OPTIONAL)
VOLUME DAMPERACCESSIBLE THROUGHAIR SLOT - 4' MODELSHAVE TWO INDIVIDUALDAMPERS
34
1116 13
4
85
2
3
4
20"
27"
40"
LENGTHAIR
DIFFUSERLENGTH
HOLD-DOWN TABS TOALIGN AND LOCK DIFFUSERTO LIGHT FIXTURE AIR SLOT(SHIPPED FLAT)
NOTES:1. DIFFUSERS ARE AVAILABLE AS RETURN UNITS. FOR REGRESSED OR FLUSH AIR HANDLING LIGHT DIFFUSERS.
2. MATERIAL: GALVANNEALED STEEL EXPOSED AREA PAINTED FLAT BLACK.
3. INSULATION IS U.L. LISTED AND MEETS NFPA 90A AND U.L. 181.
4. HEIGHT: 3½" STANDARD. CEILING CLEARANCE REQUIRED IS 3¾" PLUS AMOUNT LIGHT IS REGRESSED ABOVE CEILING LINE.
5. STANDARD DIFFUSER LENGTHS ARE STATED. ACTUAL LENGTH WILL VARY WITH LIGHT MANUFACTURER. TO INSURE CMPATIBILITY, LIST LIGHT MANUFACTURER AND MODEL NUMBER.
6. ALL DIMENSIONS ARE IN INCHES.
Diffusers—LightFixture
D 26 VAV-PRC008-EN
Diffusers—LightFixture
PerformanceData—VLSD
Projection - V and H are vertical and horizontal distance in feet to reach terminal velocities of 100 FPM and 50 FPM respectively.TSP - Static pressure drop in in. wg across the diffuser with dampers full open and horizontal air projection.NC - A one number evaluation of sound generation derived from sound power levels ( re: 10-12 watts) less 8 db room absorption. (20) indicates less than 20 NC rating.Data shown is for one diffuser. Additional diffusers will tend to increase the NC value by perhaps 2 db each, depending on size, air quantity and distance from otherdiffusers. Return applications will add +2 db to all values shown. Performance data is based on tests performed in accordance with ADC 1062 GRD-84 Test Code.
Induction DiffusersThe features of the Induction Diffuserare described by the productcategories shown in bold. Within eachcategory the options available arelisted.
MODL ModelVLSD Supply Diffuser
DSEQ Design SequenceA A Design Sequence
TYPE Diffuser TypeINDT Induction, Supply OnlyINDB Induction, Down Blow,
4. Nominal lengths of 2', 3', 4', and 5'.Actual length is nominal minus 1/4 inch.
be returned to ceiling plenum.
pattern for exterior walls or glass. Adjustable
1. High induction horizontal air flow.
2. Center down blow option provides a veritcal air
3. Supply/Return combination diffusers allow room air to
Notes:
surfaces painted flat black.5. Material: 24-gage galvannealed steel. All exposed
Blades for volume and direction control.
(INDB)
6. All dimensions are in inches.
VAV-PRC008-EN D 29
TSP - Static pressure readings in in. wg.Throw - Horizontal distance in feet to reach terminal velocity, VT, of 50 FPM.Vertical throw values are based on standard 12" long down blow slot and 3/8"width setting.NC - A one number evaluation of sound generation derived from sound powerlevels (re: 10-12 watts) less 8 db room absorption. (20) indicates less than 20 NCrating. Data shown is for one diffuser. Additional diffusers will tend to increasethe NC value by perhaps 2 db each, depending on size, air quantity and distancefrom other diffusers. Return applications will add +2 db to all valves shown.Performance data is based on tests performed in accordance with ADC 1062GRD-84 Test Code.
Perforated DiffusersThe features of the Perforated Diffuser are described by the product categoriesshown in bold. Within each category the options available are listed.
NOTES:1. COMPLETELY ASSEMBLED FOR EASY LAY-IN INSTALLATION.
2. 22-GAGE PERFORATED STEEL FACE WITH WHITE FINISH AND 51% OPEN AREA.
3. 24-GAGE STEEL PLENUM WITH BLACK INTERIOR. THE FACE FOR LEFT, RIGHT, OR VERTICAL THROW.
4. ROUND INLET SIZES 6" THROUGH 14".
5. AVAILABLE WITH DISC OR ADJUSTABLE DEFLECTOR.
6. ALL DIMENSIONS ARE IN INCHES.
D 32 VAV-PRC008-EN
Diffusers—Perforated
PerformanceData—PERF
TSP - Total pressure readings in in. wg across diffuser.Throw - Horizontal distances in feet to reach terminal velocity, VT, of 50 FPM.NC - A one number evaluation of sound generation derived from sound power levels (re:10-12 watts) less 10 db room absorption. (20) indicates less than 20 NC rating. Data shownis for one diffuser. Additional diffusers will tend to increase the NC value by perhaps 2 dbeach, depending on size, air quantity and distance from other diffusers. Return applicationswill add +2 db to all valves shown. Performance data is based on tests performed at DoncoAir Products and ETL Laboratories in accordance with ADC 1062 GRD-84 Test Code.
constructed of 24-gagegalvannealed steel. Hanger holeson each end of the diffuser forinstallation are optional. Slot edgesformed over; provide doublethickness tile support as an integralpart of the diffuser housing. Allexposed surfaces are finished withwhite enamel.
2. Insulation—The interior surface ofthe diffuser casing is acoustically-and thermally-lined with ½-inch(13 mm) 1.9 lb cu ft (30.4 kgs/cu m),R-Value of 2.1 density glass fiberwith high-density facing. Theinsulation is UL listed and meetsNFPA-90A and UL 181 standards.
3. T-Bar Ceiling—This diffuser isdesigned to install over the “T” ofmost standard exposed suspendedceilings. The end angle is providedto allow the slot to fit flush with thebottom of the “T” and ceiling tile.
4. 2x2 T-Bar Ceiling—This diffuser isdesigned to install over the “T” ofmost standard exposed suspendedceilings. The notch is provided inthe middle of the unit to allow thediffuser to set over the “T” locatedat the middle point.
5. Concealed Spline Ceiling—Thediffuser is designed to sit in thecenter of the module, parallel to themain ceiling support member. Theceiling tile rests on the edge of thedischarge slot and the flange. At-bar insert is provided in the centerof a two-way throw diffuser, whenapplicable.
6. Plaster Ceiling—The diffuser isdesigned to sit into the opening inthe plaster. The diffuser must beused in conjunction with a trimframe for a finished appearance.
7. Trim Frame—The trim frame isextruded aluminum and designedto attach to the diffuser slot(s) withclips. The trim frame is finished withwhite enamel and is designed toset into the opening of a plasterceiling for a finished appearance.
8. Fire Damper—An integral fusiblelink, 22-gage factory installed firedamper. The fusible link has amelting point of 158°F (70°C).
9. Inlet Balancing Damper—Afactory-provided and -installedsingle-blade damper, with a
position-locating handle forbalancing air.
10. Inlet—The inlet connection is sizedto fit standard, round, flexibleductwork.
11. Agency Listing—UL listed asenvironmental air terminal unit.Control #419X (1- and 2-slot only).
FAPF, VAPF, VAPS, AABD1. General Casing—This diffuser is
constructed of 24-gagegalvannealed steel. All exposedsurfaces of the diffuser are finishedwith flat black enamel. Factory-installed t-bars are finished withwhite enamel.
2. Insulation—The interior surface ofthe supply diffuser casing isacoustically- and thermally-linedwith ½-inch (13 mm) 1.9 lb/cu ft(30.4 kg/cu m), R-Value of2.1 density glass fiber with high-density facing. The insulation is ULlisted and meets NFPA-90A andUL 181 standards.
3. T-Bar Ceiling—This diffuser isdesigned to install over the “T” ofmost standard exposed suspendedceilings. The end angle is providedto allow the slot to fit flush with thebottom of the “T” and ceiling tile.
4. 2x2 T-Bar Ceiling—This diffuser isdesigned to install over the “T” ofmost standard exposed suspendedceilings. The notch is provided inthe middle of the unit to allow thediffuser to set over the “T” locatedat the middle point.
5. Plaster Ceiling—The diffuser isdesigned to set into the opening inthe plaster. The diffuser must beused in conjunction with a trimframe for a finished appearance.The trim frame is extrudedaluminum with white finish.
6. Inlet Balancing Damper—Afactory-provided and -installedsingle-blade damper, with aposition-locating handle forbalancing air.
7. Inlet – The inlet connection is sizedto fit standard, round, flexibleductwork.
INDT1. General Casing – This diffuser
is constructed of 24-gagegalvannealed steel. Exposedsurfaces are finished with flatblack enamel.
2. Insulation – The interior surface ofthe diffuser casing is acoustically-and thermally-lined with ½-inch
(13 mm) 1.9 lb cu ft (30.4 kgs/cu m),R-Value of 2.1 density glass fiberwith high-density facing. Theinsulation is UL listed and meetsNFPA-90A and UL 181 standards.
3. T-Bar Ceiling—This diffuser isdesigned to install over the “T”of most standard exposedsuspended ceilings.
4. 2x2 T-Bar Ceiling—This diffuser isdesigned to install over the “T” ofmost standard exposed suspendedceilings. The notch is provided inthe middle of the unit to allow thediffuser to set over the “T” locatedat the middle point.
5. Plaster Ceiling—The diffuser isdesigned to set into the opening inthe plaster. The diffuser must beused in conjunction with a trimframe, for a finished appearance.The trim frame is extrudedaluminum and designed to attachto the diffuser slot with clips. Thetrim frame is finished with whiteenamel.
6. Inlet Balancing Damper—Afactory-provided and -installedsingle-blade damper, with aposition-locating handle forbalancing air.
7. Inlet—The inlet connection is sizedto fit standard, round, flexibleductwork.
LITE1. General Casing—This diffuser is
constructed of 24-gagegalvannealed steel. Hold-down tabson the diffuser ends are provided toalign and lock the diffuser to thelight air slot. Exposed slot area ispainted flat black.
2. Insulation—Optional. If used, theinterior surface of the diffusercasing is acoustically and thermallylined with ½ inch (13 mm) 1.9 lb cuft (30.4 kgs/cu m), R-Value of 2.1density glass fiber with high-density facing. The insulation is ULlisted and meets NFPA-90A andUL 181 standards. The externalinsulation is foil-faced.
3. Dual Side Diffuser—This diffuseris designed for dual-sideinstallation on the light fixture.
4. Single Side Diffuser—Thisdiffuser is designed for single-sideinstallation on the light fixture. Aside bracket is provided for extrasupport.
5. Inlet—The inlet connection is sizedto fit standard, round, flexibleductwork.
MechanicalSpecifications
Diffusers
D 34 VAV-PRC008-EN
PERF1. General Casing—This diffuser
plenum is constructed of 24-gagegalvannealed steel with blackinterior. The diffuser face is 22-gageperforated steel with a white finishand 51% open area.
2. Adjustable Deflector—A set offour square louver-type deflectorsattached to the backside of theperforated panel, directly below theinlet collar. Each deflector pivots toallow for one-, two-, three-, andfour-way horizontal air patterns.Factory-set at a four-way air pattern.
Diffusers—Perforated
MechanicalSpecifications
3. Disc Deflector—A round discattached to the backside of theperforated panel, directly below theinlet collar to deflect the air in a360° horizontal air pattern.
4. T-Bar Ceiling—This diffuser isdesigned for easy lay-in installationin the suspended T-bar ceiling grid.
5. Butterfly Damper—A two-bladedvolume damper located in the inletcollar. Adjustments are madethrough the perforated metal with a screwdriver.
6. Inlet – The inlet connection is sizedto fit standard, round, flexibleductwork.