silencers for hvac

8/10/2019 Silencers For HVAC

1/12

A I R M O V EM EN T

Cylindrical & Splitter Silencers

For Fan Systems


2/122

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


3/123

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


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


4/124


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


5/125

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


6/126

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)


7/127

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


8/128

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


9/129

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.


10/1210

Splitter Silencers



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


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


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


11/1211

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


12/12

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

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