Silencers For HVAC
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A I R M O V EM EN T
Cylindrical & Splitter Silencers
For Fan Systems
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Resistance to Air FlowType C Sil encer
10
20
30
40
50
60
708090
100
200
.5 .6 .7 .8 .9 1 2 3 4 5 6 7 8 9 10 20 30 40 50
2 3 4 5 6 7 8 9 10 20 30 40 50 60 70 80 90 100
2 3 4 5 6 7 8 9 10 20 30 40 50 60 70 80 90100
30
20
109
8
7
6
5
4
3
2
1
1.0.9
.8
.7
.6
.5
.4
.3
.2
.1
.09
.08
.07
.06
.05
.04
CFM 1000
m3/h1000
PRESSURELOSSPa
VOLUME FLOW m3/s
12"
15"
19"
24"
30"
38"
48"
60"
75"
315
mm
355
mm
400
mm
450
mm
500
mm
560
mm
630
mm
710
mm
800
mm
900
mm
1000
mm
1120
mm
1250
mm
1400
mm
1600
mm
1800
mm
2000
mm
mmwg
inswg
Type B & C Sil encers
for incr eased attenuation . The pressure loss due to the pod is shown on
the chart below.The diameter range is 315 m m to 200 0 mm metric range or 12" to 75 "imperial range.
Fume HandlingStainless Steel, PVC or Polypropylene construction is also available forcorro sive atmosp heres. Please send detail s of the appli cation with theenquiry.
M arine UseThe construction of standard silencers has been proved satisfactory for
use below decks on ships and oi l ri gs and a specially strengthened de-sign is available for other l ocations, please enquire.
Temperature RangeStandard silencers are suitable for temperatures from -40C to 200C.When moisture resistant lin ing i s used the continuous air handling tem-perature is lim ited to 80C. Special treatments enable silencers to oper-ate at temperatures up to 600C. For smoke appl icatio ns, please enqui re.
FinishesStandard finish is galvanised zinc coating to BS2989 Z2. Other finishes
including epoxy paint are available to special order.
MountingGalvanised steel mounting feet and m atching flanges corresponding tothose supplied for Aerofoil fans are available.
ConstructionCasings are of rolled, pre-galvanised sheet steel with spun end rings
incorporating tapped inserts for fixing. Suitable fixing screws are pro-vided with all steel si lencers.The absorbent material is acoustic grade mineral fibre with an erosionresistant facing . It is protected and contained by a pre-g alvanisedperforated steel sheet formed to m atch the fan diameter.
Cylindri cal silencers shall be suitable for air pressures up to a maximumof 1000 Pa. For duct pressures in excess of 1000 Pa please enqui re.
A Melinex Lining (variant code M) can be supplied for critically cleanapplications such as hospitals to ensure no fibre migration. The lini ngmay also be used in moisture or g rease laden condi tions, such as kitchenextract systems where the material is used to stop the ingress of greaseetc. into the acousti c media. The use of the li nin g also allow s the sil enc-ers to be low pressur e steam cleaned. Some reduction of attentuationdue to the linin g will be experienced.
PerformancesAre derived from tests to BS848. M easurements of fan noise are madewith and without the sil encer in posi tion . The difference between re-corded levels is the dynamic (with airflow) attenuation or insertion lossof the silencer. Type B sil encers may be dir ectly coupl ed to both inl et andoutl et flanges of the fan. When type C silencers are dir ectly coupl ed tothe fan flanges they are most effective on the outlet. A spacer duct of 1Dlength between the fan inlet flange and a type C silencer is necessary toensure maximum performance. Note: C type silencers mounted close toa fan may effect the aerodynami c perform ance.
Size RangeType B silencer bore diameters range from 280 mm to 2000 m m metricrange, 6" to 75" im perial range in lengths equal to or twice the borediameter (1D or 2D) 6" to 9.5" are available in 1.5 D lengths only. Pres-sure loss for type B silencers is the same as a plain duct.Type C silencers have a centrally mounted absorbent pod in the airway
Cylindrical Silencers
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Acoustic Performance
Octave-Band M id Frequencies Hz
BoreDia. Ins
(D)Length 63 125 250 500 1K 2K 4K 8K
6 1.5D 0 0 1 6 12 9 10 7
7.5 1.5D 0 0 1 7 11 8 9 6
9.5 1.5D 0 0 2 7 11 7 7 6
121D 1 2 4 9 11 10 9 7
2D 1 2 5 11 16 12 11 10
151D 2 3 5 10 13 11 9 8
2D 3 4 7 14 18 15 11 12
191D 2 3 6 13 14 10 10 5
2D 3 4 8 19 18 14 11 10
241D 3 5 7 15 13 8 9 8
2D 4 6 9 19 19 14 13 12
30 1D 3 5 8 16 12 9 9 82D 4 6 10 19 15 12 11 10
381D 4 5 11 16 11 10 8 9
2D 4 6 13 19 13 12 11 11
481D 4 6 12 17 10 9 8 7
2D 5 7 14 19 14 11 11 9
601D 5 7 13 16 10 8 7 6
2D 6 8 15 18 12 10 9 7
Type B Dynamic Attenuation
Imperial
Metric
For sizes above 60" or 1600 mm please enquire.
Octave-Band Mid Frequencies Hz
BoreDia. mm
(D)Length 63 125 250 500 1K 2K 4K 8K
280
1D 1 1 2 8 11 8 8 7
2D 1 2 4 10 13 1 0 10 9
315 1D 1 2 4 9 11 10 9 7
2D 1 2 5 11 16 12 11 10
355 1D 1 2 4 10 12 10 9 7
2D 2 3 6 13 17 14 11 11
400 1D 2 3 5 10 13 11 9 8
2D 3 4 7 14 18 15 11 12
450 1 D 2 3 6 12 13 1 1 10 6
2D 3 4 8 17 18 15 11 11
500 1 D 2 3 6 13 14 1 0 10 5
2D 3 4 8 19 18 14 11 10
560 1D 2 4 7 14 14 9 1 0 7
2D 3 5 9 19 18 14 12 11
630 1D 2 5 7 15 13 8 9 8
2D 4 6 9 19 19 14 13 12
710 1D 3 5 7 15 13 9 9 8
2D 4 6 9 19 17 13 12 11
800 1D 3 5 8 16 12 9 9 8
2D 4 6 10 19 15 12 11 10
900 1D 3 5 10 17 13 11 10 8
2D 4 6 12 19 15 12 11 10
1000 1D 4 5 11 16 11 1 0 8 9
2D 4 6 13 19 14 12 11 11
1120 1D 4 5 11 17 11 9 8 8
2D 4 6 13 19 14 12 11 8
1250 1D 4 6 12 17 10 9 8 7
2D 4 6 14 19 14 11 11 9
1400 1D 4 6 12 16 10 8 7 6
2D 4 7 14 18 13 10 10 8
1600 1D 4 7 12 16 10 8 7 6
2D 4 8 15 18 12 1 0 9 7
Cylindrical Silencers
Octave-Band Mid Frequencies Hz
BoreDia. mm
(D)Length 63 125 250 500 1K 2K 4K 8K
315 1D 2 5 5 9 18 20 18 15
2D 2 6 6 12 20 25 20 17
355 1D 2 5 6 9 18 22 19 16
2D 2 6 7 13 25 27 21 17
400 1D 2 6 6 10 19 24 20 17
2D 3 7 8 14 29 29 23 18
450 1D 2 4 7 13 20 23 22 17
2D 2 5 9 16 29 29 21 20
500 1D 2 3 8 16 21 22 21 17
2D 2 4 10 20 29 30 20 26
560 1D 3 5 8 16 20 18 19 15
2D 4 5 10 20 29 28 21 23
630 1D 3 5 8 15 19 16 14 12
2D 5 6 10 19 29 25 21 20
710
1D 3 5 8 15 19 15 14 12
2D 5 6 10 20 26 23 18 17
800 1D 4 5 8 16 19 15 14 13
2D 5 7 11 22 23 21 16 14
900 1D 4 5 9 17 19 15 14 13
2D 5 7 12 24 23 21 16 15
1000 1D 5 5 11 18 19 15 14 13
2D 5 7 13 26 24 20 16 16
1120 1D 5 7 11 19 18 14 13 12
2D 5 8 13 25 23 18 16 13
1250 1D 5 8 12 19 17 14 12 10
2D 5 8 14 25 17 17 17 12
1400 1D 5 8 12 18 16 13 11 9
2D 5 9 15 23 22 17 15 10
1600 1D 5 8 13 17 16 13 11 8
2D 6 10 17 21 20 17 14 9
All performances are derived from tests to BS848.For increased attenuation use Woods spli tter sil encers. Attenuation figures shown are typical in- situ Dynamic Performances. Forcritical appli cations, particularly high performance fan systems p lease consult Woods Acoustic Department.
Type C Dynamic Attenuation
Octave-Band M id Frequencies Hz
BoreDia. Ins
(D)Length 63 125 250 500 1K 2K 4K 8K
12 1D 2 5 5 9 18 20 18 15
2D 2 6 6 12 20 25 20 17
15 1D 2 6 6 10 19 24 20 17
2D 3 7 8 14 29 29 23 18
19 1D 2 3 8 16 21 22 21 17
2D 2 4 10 20 29 30 26 20
24 1D 3 5 8 16 19 14 16 12
2D 5 6 10 19 29 25 21 20
30 1D 4 5 8 16 19 15 14 13
2D 5 7 10 20 23 21 17 14
38 1D 5 5 11 18 19 14 14 14
2D 5 6 13 26 24 20 18 16
48 1D 5 8 12 19 17 14 12 10
2D 5 8 14 25 23 17 17 12
60 1D 5 8 13 17 16 13 11 8
2D 6 10 17 21 20 17 14 9
Imperial
Metric
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Cylindrical Silencers
A
POD - TYPE C ONLYIDOD
2 Holesin each foot
PCD
Hole SpacingAttachableFeet(OptionalExtra)
Lifting lugs on 60" and1400 - 1600 mm sizes only
48-60" and1120 - 1600 mm2D Construction
1D 1D102 mm
Imperial Metric
Notes:1. 6" - 9.5" are 1.5D long2. For larg er si zes pl ease en qui re
mm M etric (mm) Weight kg
Size(D)
OD No of
Holes PCD Thread
MountingFoot Holes
Dia
ALength
1D
B C
280 385 4 320 M 8 10 560 9 14 - -
315 415 8 355 M 8 10 630 10 17 13 19
355 455 8 395 M 8 10 710 12 20 15 24
400 500 8 450 M 10 10 800 1 5 25 18 30
450 600 8 500 M 10 10 900 2 0 33 24 39
500 650 12 560 M 10 10 1000 25 41 29 48
560 710 12 620 M 10 10 1120 30 50 35 58
630 780 12 690 M 10 12 1260 35 61 42 72
710 860 16 770 M 10 10 1420 44 76 53 90
800 1000 16 860 M 10 12 1600 55 96 66 116
900 1100 16 970 M 12 12 1800 70 129 84 150
1000 1200 16 1070 M 12 12 1000 2000 82 157 100 182
1120 1 320 20 1190 M 12 16 1070 1120 2 342 100 211 118 247
1250 1 450 20 1320 M 12 16 1150 1219 2 540 127 266 147 306
1400 1 600 20 1470 M 12 16 1300 1400 2 902 199 399 220 453
1600 1 800 24 1680 M 16 16 1500 1600 3 302 311 637 362 739
230
265
305
350
400
450
510
580
660
750
850
950
280
315
355
400
450
500
560
630
710
800
900
2D 1D 2D 1D 2DSpacing
Packing Specifi cation
Protective Boards screwed to ends.
Packed length is Silencer length plu s 50 m m.Packed width and height Silencer O.D.
Alternative crated packing
(at extra cost)
Typically:Packed length is Silencer length plus 150 mm.Packed section is sq uare.Side dimension is Silencer O.D. plus 200 mm .
Dimensions & Weights
Ins. Imperial - Dimensions (mm) Weight kg
Size(D)
OD No of
Holes PCD Thread
MountingFoot Holes
Dia Spacing
ALength
1D
B C
6 210 4 184 M 6 7 130 229* 2.7* -
7.5 248 4 216 M 6 7 152 286* 3.6* -
9.5 298 4 273 M 8 9 194 362* 5.0* -
12 416 8 349 M8 11 273 305 6 10 10 16 12 18
15 492 8 425 M 10 11 343 381 762 13 22 16 26
19 645 8 541 M 12 11 438 483 965 24 39 28 46
24 773 12 668 M 12 11 559 610 1219 34 57 39 67
30 926 1 2 821 M 12 14 711 762 1524 51 87 60 102
38 1181 16 1035 M 16 14 914 965 1930 79 149 94 172
48 1450 20 1289 M 16 14 1143 1219 2540 114 239 133 278
60 1749 12 1626 M 16 14 1422 1524 3150 250 529 282 563
2D 1D 2D 1D 2D
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Splitter Silencers
Types WS-WSY-WBS
Choice of drilled RSA or cleat type flanges
Higher attenuation patented bend type
Galvanised steel construction
Mineral fibre splitter infill
Erosion resistant to airflow
CasingLock form ed pre-galvani sed steel sheet. Flanges of rolled steel angle hot
dip g alvanised drill ed for duct connection or, formed flanges of pre-gal-
vanised steel strip suitable for cleat fixing (Code WSY). Alternatively
spig ot ends can be provid ed, please enqui re. All welded cases are avail-
able for duct pressures between 1000 and 3000 Pa (Variant code P).
SplittersFrames are formed from pre- galvanised sheet steel. Absorb ent material
is resin bon ded mineral fibre, in slab form with erosion resistant facing.
A melinex lining (Variant Code M) can be supplied for critically clean
applications, such as hospitals to ensure no fibre migration. The lini ng
may also be used in moisture or grease laden condi tions, such as kitchen
extract systems where the material is used to stop the ingress of grease
etc. into the acoustic media. The use of the lining also allows the si-
lencer to be low pressure steam-cl eaned. Some reduction in attenuation
due to the lini ng will b e experienced. Splitters are normally mounted
vertically i n casing. For horizontal spli tters please enquire.
PerformancesData is derived from tests to BS4718 197 1. Measurements of a noise
source are made with and without the sil encer in position. The difference
between the recorded levels is the static (without airflow) attenuation orinsertion lo ss of the sil encer.
Optional moisture resistant lini ng
Low resistance to airflow
Various material and finished available
Fully tested high temperature models available
Fully metric range
Size RangeStandard heights (inside duct): 300-1500mm in 150mm increments.
Standard lengths: 600-2400mm in 300mm increments. Larger silencers
are suppl ied in sections to be fixed together on site. Silencers can be
manufactured in di mensions to sui t any applications, please discuss with
acoustic department.
Fume HandlingFor mil dly corrosi ve atmosphere epoxy paint is available (Variant code
K). Where this finish i s not sufficiently corrosion resistant many sizes
can be supplied constructed in PVC of polypropl yene.
Please enquire giving details of the application.
Temperature RangeWS, WSY, WBS - 40 to + 200C
M elinex Lining (M ) - 40 to + 80C
High Temperature (T) -40 to + 400C
PVC -40max.
Polypropylene -60max.
Low Pressure Loss
Inlet and outl et fairi ngs (Variant code L) fitted to the spli tters reduce pres-
sure losses by 25%. The silencer casing length is i ncreased by 300mm
to accommodate the fairings.
90 Bend Type SilencersType WBS is a modified splitter silencer with integral air turning vanes to
keep pressure losses to a min imum .
Additional attenuation can be obtained (see table B) together with com-
pactness in plant room l ayout.
1 2 3 4 5
50 250 500 750 1000 1250
75 275 550 825 1100 1375
100 300 600 900 1200 1500
150 350 700 1050 1400 1750
Standard widths (inside duct)
Airway
Width mm
No Modules
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Selection of Type WS/WSY Sil encers
Step No.
1) Calculate attenuation required preferably using the method
detailed in Woods electronic selection programme Design for
Sound (See Woods Acoustic Group).
2) Use Table A to select the airway width and length of si lencer.
Splitter Silencers
Example 1.
Air volume flow rate = 1.42m3/s Octave band mid freq. Hz: 63 125 250 500 1K 2K 4K 8K
Required attenuation from calculation: 6 14 26 42 48 46 40 28
Select from table A-WS/100-1500 8 15 26 43 53 53 45 32
The fan has 100 Pa static pressure available for silencer pressure loss.
The NC level required i s NC35 whi ch from Table C lim its the silencer airway velocity to 13m/ s.
From standard widths and heights a suitable WS/100 sil encer would be 600 mm wide x 600 mm hi gh.
Pressure loss from chart 3 = 65Pa
Silencer airway velocity = Volume Flow (m3/s)
No of A/W x AW width x Height
1.42 (m3/s)
2 x 0.1m x 0.6m
11.83 m/s
Silencer coding would be:-
WS 100-1500-600-600
Type
Airway width
Silencer Length
Width
Height
For Bend Silencer selections please refer to Woods Acoustic Department
3) Select width, height and pressure loss from the appropriate pres
sure loss chart Nos 1-4.
4) Check that the si lencer airway velocity is low enough for required
NC level
=
=
(metres)
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Example
WSY LM/ 75-X-X-XType
Variants
AirwayWidth mm
SilencerLength mm
Width mm
Height mm
Coding: Type WS/WSE Silencers
WS Drilled Flanges (with Side Li ners)WSY Cleat Flanges (with Side Liners)M Mo isture Resistant LiningL Low Pressure LossP High System PressureK Fume ResistantC Perforated LiningsCC Stainless Perforated Linings
Splitter Silencers
Variant
Code
Coding: Type WBS Silencers
CODE WBS (H or V)Plus Variantsas for type WS
H or V = Bend in Horizontal or Vertical Plane
Example
WBS (H) or (V) M/75-X-X-X-XType
Variants
AirwaysWidth mm
Air Entry legDimension L
1mm
Air exit legDimension L
2mm
SilencerWidth mm
Height mm
Figure 1
Figure 2
Type WBSHI1+I
2M inimum Dimension 100mm
(300m m fairings Type WBSHL)
Type WBSV
WL
H
TypeLInlet & OutletFairings(ExtendedCasing)
Type KEpoxy
Paint
Type C
Perforated SteelRetainer
TypeWSDrilledFlanges
Type PWeldedFlanges& Seams Type
WSYCleatFlanges
w
L1
L2
I1
I2
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600900
12001500180021002400
600
90012001500180021002400
600900
12001500180021002400
600
90012001500180021002400
68
1013151719
5
679
101213
45689
1112
2
345678
12162024303438
8
111417202324
79
1215172023
5
679
111315
2227364251555511
19263034404511162326303540
8
111518222630
3145555555555524
3446485055552130404347555512
202633394552
4055555555555531
4555555555553139515355555515
253341495555
4055555555555532
4555555555552939515355555515
253341495555
4055555555555524
3952555555552131414549555511
151924293439
3050555555555520
28384246555520262932364347
7
81113161921
63 125 250 500 1K 2K 4K 8KAirways
mmLength
mm
Frequency Hz
Octave Band Mid Frequencies
50
75
100
150
SilencerHeight forWBSV orwidth forWBSH
Additio nal Attenuation in Octave BandsHz
63 125 250 500 1K 2K 4K 8K
300 0 0 2 8 6 3 3 3450 0 1 5 7 4 3 3 3600 0 2 8 6 0 3 3 3750 0 3 8 5 0 3 3 3900 0 5 7 4 0 3 3 3
1050 0 7 7 4 0 3 3 31200 1 8 6 4 0 3 3 31350 2 8 6 3 0 3 3 31500 3 8 5 3 0 3 3 3
Splitter Silencers
PerformanceType WS/WSY
Intermediate airway widths can beprovided to suit i ndividual requirements.Please enquire.Care should be taken in use of 50mmAirway Silencer. Perforated Liningsare required on airways of 75mm or less.Please enquire.
The following airway velocities should not beexceeded for the ventilation space noise levels
tabulated, in order to avoid possible noise regenera-tion in the silencer.
Airway Velocity=
Volum e Flow Rate m3/sNumber of Airways x Airway Width X Height
(metres)
TABLE C
For special applications please enquire.
Type WBSThe value of additional attenuation dueto the mitred bend should be deductedfrom the attenuation required.
To obtain the attenuation, dimensionsL1+I2 must be equal or greater than 2.5x height for Type WBSV or 2.5 width forType WBSH.
Table A
Table B
Veloci ty m/s NC/NR Level
15 45-5013 35-4010 30
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Splitter Silencers
Chart 2 - Resistance to Air Flow Type WS/75
Chart 1- Resistance to Air Flow Type WS/50
0.1 0.15 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.5 2 3 4 5
300
200
150
100
90
80
70
60
50
40
30
20
10
Pressure
LossPa
H=300mm
H=450mm
H=600mm
H=900mm
H=750mm
H=1050mm
H=1200mm
H=1350mm
H=1500mm
NC40
NC35
NC30
NC25
NC20
250 mm width
500mm width
750mm width
1000mm width
1250mm width
1500mm width0.6 0.8 1.0 1.5 2.0 3.0 4.0 5.0 6.0 8.0 10 15 20 30
0.5 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.5 3.0 3.5 4.0 5.0 6.0 7.0 8.0 9 .0 10 12 14 16 18 20 25
0.5 0.6 0.7 0 .8 0.9 1.0 1.5 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10 15 200.4
0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.5 2.0 3.0 4.0 5.0 6.0 7.0 8 .0 9.0 10 1.5
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 .9 1.0 1.2 1.41.5 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 1 0
NC40
NC35
NC30
NC25
NC20
H=300mm
H=450mm
H=600mm
H=800mm
H=750mm
H=1050mm
H=1200mm
H=1350mm
H=1500mm
0.1 0.15 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.5 2 3 4 5
300
200
150
100
90
80
70
60
50
40
30
20
10
Pressure
Loss
Pa
qv- Volume Flow (m3/s)
275 mm width
550mm width
825mm width
1110mm width
1375mm width
1650mm width0.6 0.8 1.0 1.5 2.0 3.0 4.0 5.0 6.0 8.0 10 15 20 30
0.5 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.5 3.0 3.5 4.0 5.0 6.0 7.0 8.0 9 .0 10 12 14 16 18 20 25
0.5 0.6 0.7 0 .8 0.9 1.0 1.5 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10 15 200.4
0.3 0.4 0.5 0.6 0.7 0 .8 0.9 1.0 1.5 2.0 3.0 4.0 5.0 6.0 7.0 8 .0 9.0 10 15
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 .9 1.0 1.2 1.41.5 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 1 0
Note: Type WBS pressure loss is 30% higher. Type variant L pressure loss is 25% l ower.
To aid selection, the charts 1-4 show the maximum pressure drop allowable to maintain the NC/NR levels required.
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Splitter Silencers
Chart 3 - Resistance to Air Flow Type WS/100
Chart 4 - Resistance to Air Flow Type WS/150
Note: Type WBS pressure loss is 30% higher. Type Variant - L pressure loss is 25% l ower.
H=300mm
H=450mm
H=600mm
H=750mm
H=900mm
H=1050mm
H=1200mm
H=1350mm
H=1500mm
0.1 0.15 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.5 2 3 4 5
300
200
150
100
90
80
70
60
50
40
30
20
10
Pressure
Loss
Pa
qv- Volume Flow (m3/s)
300 mmwidth
600mm width
900mm width
1200mm width
1500mm width
1800mm width0.6 0.8 1.0 1.5 2.0 3.0 4.0 5.0 6.0 8.0 10 15 20 30
0.5 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.5 3.0 3.5 4.0 5.0 6.0 7.0 8.0 9 .0 10 12 14 16 18 20 25
0.5 0.6 0.7 0 .8 0.9 1.0 1.5 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10 15 200.4
0.3 0.4 0.5 0.6 0.7 0 .8 0.9 1.0 1.5 2.0 3.0 4.0 5.0 6.0 7.0 8 .0 9.0 10 15
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 .9 1.0 1.2 1.41.5 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 1 0
NC40
NC35
NC30
NC25
NC20
0.1 0.15 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.5 2 3 4 5 6
H=300mm
H=450mm
H=600mm
H=750mm
H=900mm
H=1050mm
H=1200mm
H=1350mm
H=1500mm
300
200
150
100
90
80
70
60
50
40
30
20
10
Pres
sure
LossPa
350mm width
700mm width
1050mm width
1400mm width
1750mm width
2100mm width
qv- Volume Flow (m3/s)
0.5 0.6 0.8 1.0 1.2 1 .4 1.6 1.8 2.0 2.5 3.0 3.5 4.0 5.0 6.0 7.0 8.0 9.0 10 12 14 1 6 18 20 25 30
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.2 1.4 1.5 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10 12
0.3 0.4 0.5 0 .6 0.7 0.8 0.9 1.0 1.5 2.0 3.0 4.0 5.0 6 .0 7.0 8.0 9.0 10 1.5 20
0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.5 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10 15 20
0.6 0.8 1.0 1.5 2.0 3.0 4.0 5.0 6.0 8.0 10 15 20 30 40
NC20
NC30
NC35
NC40
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Splitter Silencers
Dimension & Weights
TYPE WS/WSE/150mm AIRWAY
Number of Modules =
Example: WS/100-900-600-600
Number of M odules = = 2 M odules
Other Acoustic Products
Type WSO (splitters only) can be tailored made tofit in to buil ders work ducts and shafts.
Roof unit sil encers (Acoustic curbs)Acoustic Lourves.Acoustic Jackets for Fans.
Dimensions
Types WS and WBS si lencers
Type WSY Si lencer Cleat Flange
widthAirway size + 200mm
600100 + 200
+ + + + + + + +
+ + + + + + + +
+
+
+
+
+
A
B
E
F F F F== F FF
+
+
+
+
+
F
F
F
F
N
N
H
K
A
B
30mm
Note; A and B are internal casing dimensions.
Dimension A = (Airway width + 200 ) x No. o f modul esFlange widths E are as follows:Longest side up to 900mm - flange width E = 40mm.Longest side above 900mm - flange width E = 50mm.Dimension J
= Dim. B = 50mm when dim. E = 40mm= Dim. B = 60mm when dim. E = 50mm
Dimension K
= Dim. A = 50mm when dim. E = 40mm= Dim. A = 50mm when dim. E = 50mm
Fixing hole pitches F are in all cases 150mm, clearance holes forM 10 screws. N must not be less than 50mm.
300
450
600
300
450
600
750
900
1050
450
600
750
900
1050
1200
1350
1500
600
750
900
1050
1200
1350
1500
900
1050
1200
1350
1500
26
32
37
44
51
58
70
78
92
76
85
102
112
121
130
156
170
106
128
140
150
160
192
203
168
179
191
230
242
32
39
46
54
62
73
86
96
113
91
106
125
137
149
161
184
205
133
157
171
185
199
235
247
206
223
239
281
296
39
48
56
65
79
90
106118
138
117
131
153
168
184
199
222
243
166
193
212
230
249
294
313
255
277
298
353
375
44
55
64
75
91
103
120133
154
133
149
172
189
207
223
253
282
189
218
239
260
280
331
353
288
312
336
399
423
900mm
1200mm
1500mm
1800mm
1
2
3
4
5
Numberof
Modules
HeightB
mm
Approx. Weight in Kg forlength below
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A I R M O V EM EN T
Due to a policy of continuous development and im provement the right is reserved tosupply products which m ay differ from those il lustrated and described in this publication.Certified dimensions will be supplied on request on receipt of order.
U.K.EnglandSouth & South EastWoods Air Movem ent Limited
Tufnell WayColchester CO4 5ARTe lephone: + 44 (0 ) 1 206 54 412 2Facsim il e: + 44 ( 0 ) 1 20 6 57 443 4E-mail: enquiry@ woo ds-fans.com
WalesMidlands & South WestWoods Air Movem ent Limited
Waterlinks House, Richard StreetBirmingham B7 4AATe lephone : + 4 4 ( 0 ) 121 35 9 66 33Facsim il e: + 44 ( 0 ) 121 35 9 18 18E-mail: birmingham @ woods-fans.com
Scotland &North of EnglandWoods Air Movem ent Limited
First Floor, Entrance 6, Crossford CourtDane Road, Sale, Cheshire, M3 3 7 BZTe lephone: + 44 (0 )1 61 9 69 199 2Facsim il e: + 44 ( 0 ) 16 1 96 9 46 12E-mail: manchester@ woods-fans.com
USAAmerican Fan Company29 33 Symm es RoadFairfieldOhio 450 14 , USATelephone: +1 513 874 2400Facsim il e: + 1 51 3 8 70 62 49
E-mail: af-sales@ amfan -woods.com
InternationalCanadaWoods Air Movem ent ( Canada) Ltd401 Traders BlvdUnit #8 , M ississaugaOntario L4Z 2 H8 CanadaTe lephone: + 1 905 50 1 0 21 1Facsim il e: + 1 90 5 5 01 03 99E-mail: sales@ woodsfanscanada.com
FranceCie Franaise Woods1 6 BurospaceF91772 Bivres CedexFrance
Telephone: +3 3 (0 ) 1 6 0 19 5 5 94Facsimile: +3 3 (0 ) 1 60 1 9 55 7 1E-mail: woo dsfr@ gec-france.fr
ItalyWoods Italiana SpAVia Montenero 55 / 5720 09 2 Cinisel lo Balsamo
Milan, ItalyTelephone: +39 02 61 86091Facsim il e: + 3 9 0 2 6 1 8 609 47E-mail: info@ woods-italiana.it
EuropeFinlandWoods Puhallin OyRuosilantie 2b00 39 0 Hels ink iFinlandTe lephone: + 3 5 8 9 54 0 4 77 0Facsim il e: + 3 5 8 9 5 40 47 75 4
E-mail: info@ woods-puhallin.fi
GermanyWoods Ventilatoren GmbHSiemensstrasse 1640 88 5 Rat ingenGermanyTelephone: +49 21 02 31068Facsim il e: + 4 9 2 1 0 2 3 911 3
E-mail: w oods@ t-online.de
SingaporeWoods Singapore PteMarconi Building3 Tai Seng DriveSingapore 53 52 16
Telephone: +6 5 3 82 82 33Facsimi le : +65 3828200E-mail: sales@ woo ds.com. sg
Woods Air Movement Limited is represented in over 70 countries world-wide.See our website for details - www.woods-fans.com
Publication No: SP/01January 2001