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FLOW ~ T E C HAI R D IS T R IBUT ION S PEC IAL I S T
SCD Supply Ceiling DiffuserRCD Return Ceiling DiffuserPCD Perforated Ceiling DiffuserCED Combined Ceiling Diffuser
with Egg Crate Core
FAISAL JASSIM INDUSTRIES (L.L.C.)P 0. Box: I 871 Dubai, U.A.E.
Tel: +971 4 Z582 64 0Fax: +971 4 8 2 6 ~ 1
E-mail: [email protected]: www.faisaljassim.ae
www.flowtechind.com
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CEILING DIFFUSERSA I R D I S T R I B U T I O N S P E C I A L I S T
APPLICATIONS
FLOWTECH provides a wide range of Ceiling Diffusers
to suite the various requirements of ceiling air
distribution.
Supply air ceiling diffusers (SCD) and return air ceiling
diffusers (RCD) can be Square or Rectangular Ceiling
Diffusers with One, Two, Three or Four Way Patterns.
The different diffuser patterns are used to control
supply air direction. Typical examples of such
application are supply diffusers near glass areas, supply
diffusers in corridors, and supply diffusers in space
corners.
FLOWTECH SCD is supplied with Opposed Blades
Damper (OBD) to facilitate for precise air volume
control. (Note: OBD is used for fine tuning of air
volume flow rate, and should not be used to replace
branch Volume Control Damper). RCD is supplied
without OBD and usually used for return air
applications. In certain applications, SCD must be used
as return air diffuser; that is, where return air volume
requires precise control, such as room pressurization
applications. This is frequently required for Clean Room
Engineering applications such as Hospitals,
Pharmaceutical Plants, Biotech Laboratories, Computer
Rooms and Silicon Industry.
SCD and RCD are commonly used for Heating,
Cooling and Isothermal Ventilation applications.
However, such applications are limited to 4 meters
ceiling high. For Ceiling Heights above 4.0 Meters, refer
to specialty terminal devices, such as Jet Nozzle
Diffusers and Drop Ceiling Diffusers.
SCD and RCD are tested by ETL Semko USA to
ASHRAE 70 - 1991 standard method of testing for
rating performance of air outlets and inlets.
Perforated ceiling diffuser (PCD) is of same
construction as SCD but with a removable perforated
face of G1 sheet powder coated, or aluminium sheet as
optional.
Supply Air 4 Way ceiling diffuser (SCD-4S)
Supply Air 3 Way ceiling diffuser (SCD-3S)
4 Way supply ceiling diffuser with perforated face (PCD)
Return Air Rectangular 4 way ceiling diffuser (RCD- 4R)
F-1Rev. 0:2005/1
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F L O W ~ E C HA IR DISTR I BUTION S PEC IAL I S T
MATERIAL: Opposed Blades Damper (OBD):Frame and Core are made of extrudedaluminum alloy 6063 to T6 Heat Treatment. FLOWTECH OBD is fixed to the rear frame of SCDmodel by means of "S" clamp for ease of removal andrigid construction.The Opposed Blades Damper is extrudedaluminum alloy 6063/T6.Mitred ComerSpring loaded core
To adjust the OBD opening, remove the core and tumthe adjustment screw ava ilab le at the front face of thedamper (Clockwise to open I Counter Clockwise toClose) .
(A)-12 mm- g ~ ~ F - ~ ~I
(A)+66mm(A)+ I45mm
_ __ - Multi pattern ceiling diffuse r section without damper (RCD)
(A)-12 mm
J\J\1\J\J\ EEj ; : : : = . ~ = ; ; ~ : : = ~ ~ ~ ~ ~ -...~ - - - ~ - - ~ - - ~ ~ - - ~ ~ - - ~ ~ - - ~ - - - - ~ - - ~ - -- ! - - ~ - - - - + l
- Multi pattern ce iling d1ffuser section with damper (SCD)
Square ce iling diffusers Rectangular ceiling diffusersNeck Size Face Size Ax B Size (mm)ISO x ISO 295 X 295 225 X ISO 375 X 30022S X 22S 370 X 370 300 X ISO 450 X 300300 X 300 445 X 445 37S X ISO 525 X 3004SO x ISO 600 X 30037S X 37S 520 X 520 S2S X ISO 670 X 3004S0 X 450 595 X 595 300 X 22S 450 X 375S2S X S2S 670 X 670 375 X 225 525 X 3754S0 X 22S 600 X 375600 X 600 745 X 745 S25 X 225 670 X 375
F-2 Rev.0:2005/ I
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F L O W ~ E C HA IR D IST R IBUTION S PEC IAL I S T
Available in Powder coated RAL 9010 or.as standerd color 9016 ( __.- By self tapping screw through the ned
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CEILING DIFFUSERSA I R D I S T R I B U T I O N S P E C I A L I S T
4 WAY DISCHARGE
2 WAY DISCHARGE
1 WAY DISCHARGE
Square (SCD-4S) Rectangular (SCD-4R) Square (SCD-3S)
3 WAY DISCHARGE
Rectangular (SCD-3R)
Square (SCD-2S) Corner (SCD-2SC) Rectangular
Vertical (SCD-2RV)
Rectangular
Horizontal (SCD-2RH)
Square (SCD-1S) Rectangular
Vertical (SCD-1RV)
Rectangular
Horizontal (SCD-1RH)
MULTI PATTERN CEILING DIFFUSERS
F-4 Rev. 0:2005/1
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FLOW ' -TECHAIR D I S TR IBUT ION S PEC IAL I S T
_ Perforated Cei ling Diffuser (PCD)
Product Features:
This product is designed to provide laminar flow withlow velocit ies, evenly distributed downward movingconditioned air.
Accessories:
The perforated ceiling diffuser is especially effective inareas with heavy, localized intemal loads, as incomputer rooms. The column of air delivered by theperforated ceiling diffuser cools t he load sourcedirectly without generating high velocities in theoccupied space.
Opposed blade damper for supply (optional)- OBDThe special ly designed blad es have an overlapping lipwhich assure a tight closure.
Equalizing grid (optional) - EGIndividually adjustable blades, to provide precisedirectional control of air t hrough the diffuser.
Control is done by adjustment screw through the face ofdiffuser.Material: Extruded aluminum construction.
Rev. 0:2005/ I
Nylon tension bushes.Extruded aluminum construction.
F-5
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AIR D I S TR I B UTION S PEC IAL I S T
- - Combined Ceiling Diffusers (CED)
(A)-12 mmGasket (optional) I. 73921I II (A)+ 145mm
I 3B mm I I~ - - - - - - - ; ; : ; ;~133mm I
Side Section of Combined Ceiling Diffusers (CED)
Product Feature s: Standard Sizes: This model is des igne d to handle both supply and (Use any combination of ength & width)return air requirements in a single unit. Conditioned air is supplied at the outer perimeter,and the retum is through the center core. The center core which ist he ret urn part is made ofaluminium egg crate grid (CEO), the size can bedetermined according t o the supply and return airflow requirements.
The mi nimum size of he ce nte r core is 75mm, themaximum size is equal to the nominal size of thecombined ce iling diffuser minus 75mm, howeverthe size ofthe core must be in steps of 75mm.Available types of finishing:
Powder coated (painted to RAL codes)
F-6
Length A (mm) Width B (mm)300 300375 375450 450525 525600 600
To convert into Imperial un its use (I inch=25mm)Non standard sizes are avai lable upon requestCore size to be mentioned separately
Rev. 0:2005/ I
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A IR DISTR IBUT ION S PEC IAL I S T
DOD-DO- A X B - DODDI I I I
~ RAL CodeCo lor
Width in mm oinch
Length in mmor inch
SCD or RCD - 4S : 4 Way Square D iffuserSCD or RCD - 4R : 4 Way Rectangular DiffuserSCD or RCD - 3S : 3 Way Squa re D iffuserSCD or RCD- 3R : 3 Way Rectangular DiffuserSCD or RCD - 2S : 2 Way Square DiffuserSCD or RCD- 2RV: 2 Way Rectangular VerticalSCD or RCD - 2RH: 2 Way Rectangular HorizontalSCD or RCD - I S : I Way Square DiffuserSCD or RCD - IRV: I Way Rectangular VerticalSCD or RCD - IRH : I Way Rectangular HorizontalPCD : Perforated Ceiling DiffuserCED : Comb ined Ceiling Diffuser
with Egg Crate Core Pattem.
SCD-4S-300mm X 300mm-9010Stands fo r Sup ply Ceiling Diffuser, 4W ay, 300x300coat ing color RAL 90 I0.
Rev. 0:2005/1 E-7
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CEILING DIFFUSERSA I R D I S T R I B U T I O N S P E C I A L I S T
GENERAL NOTES
Pages onwards give performance data for all models
and variants, and unless otherwise stated the following
general notes apply:
1 Throws shown are to three terminal velocity of
0.25m/s, 0.5m/s, 0.75m/s, (50fpm, 100fpm,
150fpm) with coanda effect across a flat ceiling,
and with supply air at conditions with max
DT=10K cooling.
2 For standard room height of 2.75 metres, throws
should be taken as the distance to the nearest wall
(minimum plan dimension, MPD), or to half thedistance between diffuser centres.
4 When mounted without a surrounding closed
ceiling the throw will be reduced by approx. 40%,
ie throw = table throw x 0.6
However in order to avoid the airflow 'dumping'
into the space when on cooling mode, giving
excessive velocities, it may be necessary for coanda
plates to be fitted to the diffuser. Please check with
factory for details.
5 Another fault that can give rise to 'dumping' on
cooling cycles is low jet velocities at the diffuser
core. In order to avoid this it is advisable to ensure
that neck velocities do not drop below 0.75m/s,
(150fpm).
6 The accoustical data were tested in accordance to
ASHRAE 70-1991 standard. The octave band
sound power levels obtained were plotted to
determine the point of tangency with the highest
rank Noise Criteria curve (NC) to establish the
NC. Noise Criteria ratings were determined by
subtracting room absorption of 10dB from the
sound power level data.
7 NC, and Pressure values shown, are based on a
diffuser complete unit with an opposed blade
damper in the fully open position for the supply
diffuser and without for the return diffuser. The
damper should only be used for fine balancing, as
for every doubling of pressure there is a resulting
increase in the noise level of +9dB for supply, or
+5dB for exhaust.
8 Models with reduced necks.
There is a 'dilution effect' on performance for these
models, as the air tends to spread behind the core,
reducing throws by up to 20%, depending on therelationship between the neck size and the base
diffuser size. For more information please check
with the factory.
9 For rectangular diffusers, throw values tested are on
the longer side of the diffusers. For the shorter side
throws, values are to be multiplied by 0.72.
10 Corrections for 1, 2 and 3 way diffusers
3 way pattern throw : Multiply by 1.15
2 way pattern throw : Multiply by 1.25
1 way pattern throw : Multiply by 1.45
11 The following tables include the results of tests
conducted on samples of air terminals. The test
results include Noise Criteria (NC), static pressure
verses air flow, throw and effective area.
Extrapolation was used to obtain the performance
for other sizes and other parameters within the
range of products mentioned above.
Test method included in ETL report.
F-8 Rev. 0:2005/1
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CEILING DIFFUSERSA I R D I S T R I B U T I O N S P E C I A L I S T
PERFORMANCE DATA - SI UNITS
SYMBOLS
L/Sec :Air volume in litres per second.
Af :Effective free area in square meters.
Vf :Face velocity in meters per second.
Ak :Neck area in square meters.
Vk :Neck velocity in meters per second.
Pt :Total pressure in pascal
Th. :Throw in meters.
NC :Noise Criteria.
NOTES
The large throw values are based on the minimum
terminal velocity of 0.25 m/Sec. The middle throw values are based on the medium
terminal velocity of 0.50 m/Sec.
The small throw values are based on the maximum
terminal velocity of 0.75 m/Sec.
CONDITIONS
Supply or Return as indicated.
Noise Criteria values are based on (10 dB) room
attenuation.
Damper is fully open.
Maximum room height = 4.0m
Cooling @ T = 10k
CORRECTION FOR 1, 2 AND 3 WAY
Noise criteria : No correction required.
Pressure : No correction required.
Throw : 3 way - increase for 15%: 2 way - increase for 25%
: 1 way - increase for 45%
Drop : No correction required.
F-9Rev. 0:2005/1
ETL TEST REPORTS
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See notes on page F-9
SIZE
(mmxmm)
NECK
AREA
(m2)
FREE
AREA
(m2)
NECK
VELOCITY (m/s)1.00 1.50 2.00 2.25 2.50 2.75 3.00 3.50 4.00
150x150 0.019 0.009
Q (L/s) 19 29 38 43 48 52 57 67 76
Vf (m/s) 2.13 3.19 4.26 4.79 5.32 5.85 6.38 7.45 8.51
Pt (Pa) 3 7 13 17 21 29 38 41 52
Throw (m) 0.9 1.2 2.4 1.2 1.8 3.4 1.8 2.7 4 .2 2.0 3.0 4 .5 2.1 3.3 4.8 2.4 3.5 4 .9 2.7 3.6 4.9 3.0 3.9 5 .4 3.3 4.2 5 .4
NC
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See notes on page F-9 Contd...
A I R D I S T R I B U T I O N S P E C I A L I S T
CEILLING DIFFUSERS
F-11Rev. 0:2005/1
SUPPLY AIR CEILING DIFFUSER, 4 WAY - (SCD - 4R) SI - UNITS
SIZE
(mmxmm)
NECK
AREA
(m2)
FREE
AREA
(m2)
NECK
VELOCITY (m/s)1.00 1.50 2.00 2.25 2.50 2.75 3.00 3.50 4.00
225x150 0.029 0.014
Q (L/s) 29 44 59 66 73 81 88 103 118
Vf (m/s) 2.17 3.25 4.33 4.87 5.41 5.96 6.50 7.58 8.66
Pt (Pa) 2 3 7 12 17 23 29 38 51
Throw (m) 1.2 1.8 3.3 1.8 2.4 4.2 2.4 3.3 5 .1 2.7 3.6 5 .6 3.0 3.9 6.0 3.3 4.2 6 .3 3.6 4.5 6.6 4.2 5.1 7 .2 4.5 5.4 7 .5
NC
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A I R D I S T R I B U T I O N S P E C I A L I S T
CEILLING DIFFUSERS
See notes on page F-9 Contd...
F-12Rev. 0:2005/1
SIZE
(mmxmm)
NECK
AREA
(m2)
FREE
AREA
(m2)
NECK
VELOCITY (m/s)1.00 1.50 2.00 2.25 2.50 2.75 3.00 3.50 4.00
375x225 0.077 0.034
Q (L/s) 77 116 155 174 193 213 232 271 309
Vf (m/s) 2.29 3.43 4.58 5.15 5.72 6.29 6.87 8.01 9.15
Pt (Pa) 3 4 9 13 17 21 26 33 42
Throw (m) 1.8 2.7 4.5 2.7 3.9 6.9 3.6 5.1 7 .8 5.4 5.4 8.3 7.2 5.7 8.7 6.2 6.0 9 .2 5.1 6.3 9 .6 5.7 6.9 11.0 6.6 7.8 11.0
NC
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A I R D I S T R I B U T I O N S P E C I A L I S T
CEILLING DIFFUSERS
See notes on page F-9
F-13Rev. 0:2005/1
SIZE
(mmxmm)
NECK
AREA
(m2)
FREE
AREA
(m2)
NECK
VELOCITY (m/s)1.00 1.50 2.00 2.25 2.50 2.75 3.00 3.50 4.00
600x300 0.169 0.069
Q (L/s) 169 254 339 381 423 466 508 593 677Vf (m/s) 2.47 3.71 4.94 5.56 6.18 6.80 7.41 8.65 9.88Pt (Pa) 3 4 9 13 17 21 26 36 50
Throw (m) 2.4 3.3 7.2 3.9 6.0 9.3 5.7 7.8 11.0 6.3 8.3 12.2 6.9 8.7 13.0 7.4 9.2 13.5 7.8 9.6 14.0 8.4 11.0 15.0 9.0 11.0 17.0
NC
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A I R D I S T R I B U T I O N S P E C I A L I S T
CEILLING DIFFUSERS
SIZE
(mmxmm)
NECK
AREA
(m2)
NECK
VELOCITY
(m/s)
1.00 1.50 2.00 2.25 2.50 2.75 3.00 3.50 4.00
150x150 0.019Q (L/s) 19 29 38 43 48 52 57 67 76
Pt (Pa) 8 12 18 20 21 22 24 35 45
NC
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A I R D I S T R I B U T I O N S P E C I A L I S T
CEILLING DIFFUSERS
SIZE
(mmxmm)
NECK
AREA
(m2)
NECK
VELOCITY
(m/s)
1.00 1.50 2.00 2.25 2.50 2.75 3.00 3.50 4.00
225x150 0.029
Q (L/s) 29 44 59 66 73 81 88 103 118
Pt (Pa) 10 14 20 22 23 30 37 55 75
NC
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A I R D I S T R I B U T I O N S P E C I A L I S T
CEILLING DIFFUSERS
SIZE
(mmxmm)
NECK
AREA
(m2)
NECK
VELOCITY
(m/s)
1.00 1.50 2.00 2.25 2.50 2.75 3.00 3.50 4.00
525x300 0.148Q (L/s) 148 222 295 332 369 406 443 517 591
Pt (Pa) 10 14 20 22 23 30 37 55 75
NC
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CEILING DIFFUSERSA I R D I S T R I B U T I O N S P E C I A L I S T
PERFORMANCE DATA - IP UNITS
SYMBOLS
CFM :Air volume in cubic feet per minute.
Af :Effective free area in square feet.
Vf :Face velocity in feet per minute.
Ak :Neck area in square feet.
Vk :Neck velocity in feet per minute.
Pt :Total pressure in inches water gauge.
Th. :Throw in feet
NC :Noise Criteria.
NOTES
The large throw values are based on the minimum
terminal velocity of 50 fpm. The middle throw values are based on the medium
terminal velocity of 100 fpm.
The small throw values are based on the maximum
terminal velocity of 150 fpm.
CONDITIONS
Supply or Return as indicated.
Noise Criteria values are based on (10 dB) room
attenuation.
Damper is fully open.
Maximum room height = 4.0m
Cooling @ T = 10K
CORRECTION FOR 1, 2 AND 3 WAY
Noise criteria : No correction required.
Pressure : No correction required.
Throw : 3 way - increase for 15%
: 2 way - increase for 25%
: 1 way - increase for 45%
Drop : No correction required.
Notes:
F-17Rev. 0:2005/1
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See notes on page F-17 Contd...
SIZE
(in x in)
NECK
AREA
(SQ.FT.)
FREE
AREA
(SQ.FT.)
NECK
VELOCITY (fpm)200 300 400 450 500 550 600 700 800
6x6 0.205 0.096
Q (CFM) 40 61 81 91 101 111 121 141 161Vf (fpm) 426 638 851 957 1064 1170 1277 1489 1702
Pt (in-wg) 0.014 0.030 0.054 0.069 0.083 0.118 0.152 0.164 0.209Throw (ft) 3 4 8 4 6 11 6 9 14 6 10 15 7 11 16 8 11 16 9 12 16 10 13 18 11 14 18
NC
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See notes on page F-17 Contd...
A I R D I S T R I B U T I O N S P E C I A L I S T
CEILLING DIFFUSERS
F-19Rev. 0:2005/1
SUPPLY AIR CEILING DIFFUSER, 4 WAY - (SCD - 4R) IP - UNITS
SIZE
(in x in)
NECK
AREA(SQ.FT.)
FREE
AREA(SQ.FT.)
NECK
VELOCITY (fpm)200 300 400 450 500 550 600 700 800
9x6 0.316 0.146
Q (CFM) 62 93 125 140 156 171 187 218 249
Vf (fpm) 433 650 866 975 1083 1191 1299 1516 1733Pt (in-wg) 0.008 0.014 0.029 0.049 0.069 0.094 0.118 0.152 0.207Throw (ft) 4 6 11 6 8 14 8 11 17 9 12 18 10 13 20 11 14 21 12 15 22 14 17 24 15 18 25
NC
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See notes on page F-17 Contd...
A I R D I S T R I B U T I O N S P E C I A L I S T
CEILLING DIFFUSERS
F-20Rev. 0:2005/1
SIZE
(in x in)
NECK
AREA
(SQ.FT.)
FREE
AREA
(SQ.FT.)
NECK
VELOCITY (fpm)200 300 400 450 500 550 600 700 800
15x9 0.832 0.363
Q (CFM) 164 246 328 369 410 451 492 574 656Vf (fpm) 458 687 915 1030 1144 1259 1373 1602 1831
Pt (in-wg) 0.010 0.014 0.037 0.052 0.066 0.085 0.104 0.134 0.170Throw (ft) 6 9 15 9 13 23 12 17 26 18 18 27 24 19 29 20 20 30 17 21 31 19 23 34 22 26 37
NC
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See notes on page F-17
A I R D I S T R I B U T I O N S P E C I A L I S T
CEILLING DIFFUSERS
F-21Rev. 0:2005/1
SIZE
(in x in)
NECK
AREA
(SQ.FT.)
FREE
AREA
(SQ.FT.)
NECK
VELOCITY (fpm)200 300 400 450 500 550 600 700 800
24x12 1.823 0.737
Q (CFM) 359 539 718 808 898 987 1077 1257 1436Vf (fpm) 494 741 988 1112 1235 1359 1483 1730 1977
Pt (in-wg) 0.010 0.014 0.037 0.052 0.066 0.085 0.104 0.145 0.199
Throw (ft) 8 11 24 13 20 31 19 26 37 21 27 40 23 29 42 24 30 44 26 31 46 28 34 50 30 37 55
NC
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A I R D I S T R I B U T I O N S P E C I A L I S T
CEILLING DIFFUSERS
SIZE(in x in)
NECK
AREA(SQ.FT.)
NECK
VELOCITY(fpm)
200 300 400 450 500 550 600 700 800
6x6 0.205Q (CFM) 40 61 81 91 101 111 121 141 161
Pt (in-wg) 0.032 0.048 0.072 0.078 0.084 0.090 0.095 0.141 0.181
NC
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A I R D I S T R I B U T I O N S P E C I A L I S T
CEILLING DIFFUSERS
SIZE(in x in)
NECK
AREA(SQ.FT.)
NECK
VELOCITY(fpm)
200 300 400 450 500 550 600 700 800
9x6 0.316Q (CFM) 62 93 125 140 156 171 187 218 249
Pt (in-wg) 0.040 0.056 0.080 0.086 0.092 0.120 0.149 0.221 0.301
NC
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See notes on page F-17
A I R D I S T R I B U T I O N S P E C I A L I S T
CEILLING DIFFUSERS
SIZE
(in x in)
NECK
AREA
(SQ.FT.)
NECK
VELOCITY
(fpm)
200 300 400 450 500 550 600 700 800
24x12 1.823Q (CFM) 359 539 718 808 898 987 1077 1257 1436
Pt (in-wg) 0.040 0.056 0.080 0.086 0.092 0.120 0.149 0.221 0.301
NC 15 18 21 26 30 34 37 43 49
18x15 1.712Q (CFM) 337 506 674 758 843 927 1011 1180 1348
Pt (in-wg) 0.040 0.056 0.080 0.086 0.092 0.120 0.149 0.221 0.301
NC 15 17 20 25 29 33 37 43 49
21x15 2.005Q (CFM) 395 592 790 887 987 1085 1184 1382 1579
Pt (in-wg) 0.040 0.056 0.080 0.086 0.092 0.120 0.149 0.221 0.301
NC 16 18 21 26 31 35 38 44 50
24x15 2.298Q (CFM) 453 679 905 1018 1131 1243 1358 1584 1810
Pt (in-wg) 0.040 0.056 0.080 0.086 0.092 0.120 0.149 0.221 0.301
NC 17 18 22 27 32 36 39 45 51
21x18 2.419Q (CFM) 476 715 953 1072 1191 1309 1429 1667 1905
Pt (in-wg) 0.040 0.056 0.080 0.086 0.092 0.120 0.149 0.221 0.301
NC 17 19 22 27 32 36 39 45 51
24x18 2.772Q (CFM) 546 819 1092 1227 1365 1501 1638 1911 2184
Pt (in-wg) 0.040 0.056 0.080 0.086 0.092 0.120 0.149 0.221 0.301
NC 18 20 23 28 33 37 40 46 52
24x21 3.247Q (CFM) 639 959 1279 1438 1599 1759 1918 2238 2558
Pt (in-wg) 0.040 0.056 0.080 0.086 0.092 0.120 0.149 0.221 0.301
NC 18 21 24 29 34 38 41 47 53
RETURN AIR CEILING DIFFUSER, 4 WAY - (RCD - 4R) IP - UNITS