Fan Silencers and Accessories

Features

  • Polyethylene is excellent material for the use in the manufacture of fan silencers as it is non corrosive, flexible and provides ready inbuilt noise absorption.

  • Available in high visibility yellow.

  • Durable and impact resistant.

  • Polyethylene silencers are extremely light weight and have a decided weight advantage over current silencers available making installation and removal a much easier task to perform.

  • Another advantage is that the overall diameter of the fan assembly has not been increased by the silencer.
    By using high tech sound foam and sound barrier, we are able to maintain an overall width of < 50mm, compared to conventional Rock Wall type (overall > 120mm). This means that the silencer O.D. does not exceed the fan flange.

  • Low Maintenance By using Closed Cell Foam and protective coating, we are able to produce a silencer which is impervious to moisture and dust, resulting in little or no maintenance.

  • Silencers can be bolted end to end when mounting a fan in a restricted area such as a vent access wall.
Fan Silencer Features
Fan Silencer Construction

Construction

  • H.D.P.E. Polyethylene Sheeting is used for the inner and outer casings with the inner cylinder strategically punched out to assist the performance of the noise barrier.

  • The casing end flanges are constructed from 20mm H.D.P.E. and formed to fit any fan on request, then bolted together sandwiching the existing steel flange on the fan.

  • Silencers are bolted through the existing P.C.D's on the steel flange to the flange on the end of the silencer for added support.

  • The length of all silencers are generally built to 1.5 x the diameter of the fan to maximise the level of noise reduction. However, shorter versions are available for constricted areas.

  • Available with detachable polyethylene bell or bag cone ends.

Fan Silencer Types

Polyline
Stock Code

Silencer 
Type
Length
Weight
G001
VH713
1m
 -
G002
700-762
1m
-
G003
HF 804
1.2m
G004
GAL 9
1.6m
G005
ES 9
1.6m
G006
HF 1004
1.6m
G007
HF1200
1.6m
G008
ABB 1220
1.6m
G009
GAL 12.5
1.6m
100kg
G010
HF 1254
1.6m
100kg
G011
CC 1400
Short 1.6m
125kg
G012
HF 1400
Short 1.6m
125kg
G013
CC 1400
Long 2m
160kg
G014
HF 1400
Long 2m
160kg
G015
HF 1454
Short 1.6m
G016
HF 1454
Long 2m
Fan Silencer Types

 

Flange Specifications

 

 

Flange Specifications

The following table details standard flange configurations that Polyline manufactures. Other configurations can be accommodated to suit your requirements.

Silencer 
Type

'A'
Case I.D.

'B'
Flange
O.D.
'C'
Bolt P.C.D.
'D'
Hole
Dia
'E'
No
Holes
HF 804
804
890
841
14
16
GAL 9
904
1018
960
20
16
ES 9
997
1119
1060
22
16
HF 1004
1005
1093
1047
14
16
HF1200
1212
1360
1260
24
16
ABB 1220
1232
1385
1289
18
20
GAL 12.5
1258
1400
1330
24
16
HF 1254
1260
1370
1320
18
20
CC 1400
1412
1550
1490
24
16
HF 1400
1400
1542
1488
22
16
HF 1454
1458
1600
1530
18
20

 

Intake Cones

Intake Cones are manufactured in various diameters and transitions as required.

Polyline
Stock Code

Silencer Type
G017
700-762
G018
HF 804
G019
GAL 9
G020
ES 9
G021
HF 1004
G022
AF 1200
G023
ABB 1220
G024
GAL 12.5
G025
HF 1254
G026
CC 1400
G027
HF 1400
G028
HF 1454

 

Intake Cones
Bag Adaptors

Bag Adaptors

Bag Adaptors are manufactured in various diameters and transitions as required.

Polyline
Stock Code

Silencer Type
Bag Adaptor Size
G029
700-762
700-762
G030
HF 804
804-800
G031
GAL 9
900-915
G032
GAL 9
900-1067
G033
ES 9
900-915
G034
ES 9
900-1067
G035
HF 1004
1004-1000
G036
AF 1200
1200-1200
G037
ABB 1220
1200-1200
G038
GAL 12.5
1250-1200
G039
HF 1254
1254-1200
G040
CC 1400
1400-1400
G041
HF 1400
1400-1400
G042
HF 1454
1454-1400

Self Regulating Fan Covers

A simple configuration that bolts to the fan flange and automatically opens or closes with air flow from the fan.

 

Self Regulating Fan Covers

Silencer Test Results

Fan type tested: Twin 45 kW Howden

Silencer length: 1.8m each

Overall fan length: 4.9m (incl. intake/exhaust cones)

Silencer weight: Approx. 105kg (including bell and cone end fittings)

Average db(a) rating of fan unsilenced: 105.2db(a) at 1 metre (including line of sight at intake and exhaust)

Average db(a) rating silenced at 1 metre: 88.9 db(a) average (at 1 metre the reflective influences were negligible)

Average at 3 metres:
There was a significant reduction at 3 metres in the high 70 db(a).
The amount reduced would be even greater in a free field condition whereas the actual test conditions included significant reflective surfaces (e.g. factory wall and plant machinery)

Noise level average reduction at 1 metre:
16.3 db(a) average decrease at 1 metre (inclusive of line of sight at intake and exhaust)

All tests were undertaken by
Trevor Holland (Dip Mech Eng, Grad A.A.F.) from Industrial Noise Control Pty. Ltd.
and duplicated using the same location and conditions.

This product range can be downloaded as a PDF file here - Fan Silencers and Accessories (PDF, 144kb)