Polyline’s Fan Silencers are designed for the Underground Mining environment to provide ready inbuilt noise absorption.
High tech sound foam and sound barrier is critical to the fabrication process to lower noise volume.
An overall width of < 50mm is maintained, unlike conventional Rock Wall types (overall > 120mm). This means that the silencer outside diameter does not exceed the fan flange.
Silencers can be bolted end to end when mounting a fan in a restricted area such as a vent access wall. They are available in high visibility yellow.
- High-Density Polyethylene (HDPE) 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 HDPE 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.
Advantages of Polyline's Fan Silencers
- Non-Corrosive
Excellent in damp and salty environments, a superior to steel silencers
- Maintenance Free
By using ‘closed cell’ foam and protective coating, we are able to produce a silencer which is impervious to moisture and dust, resulting in no maintenance.
- Durable, Impact Resistant
This product can take severe impact and return to its original shape
- Extremely Lightweight
Enables installation & removal an easier task to perform, especially in difficult locations
- Size Efficient
The overall diameter of the fan assembly is not increased by the silencer, preventing catch points in environments such as Underground Mining
With Polyline’s specialist fabrication capabilities in fan silencers, be sure to send us a message for a free estimate!
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 | The following table details standard flange configurations that Polyline manufactures. Other configurations can be accommodated to suit your requirements.
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 | Vent Bag Adaptors are manufactured in various diameters and transitions as required.
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 | Intake Cones are manufactured in various diameters and transitions as required.
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| Self-Regulating Fan Covers | |||
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 | 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. |
Fan Silencers
| 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 | – |
Flanges
The following table details standard flange configurations that Polyline manufactures. Other configurations can be accommodated to suit your requirements.
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Vent Bag Adaptors
Vent Bag Adaptors are manufactured in various diameters and transitions as required.
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Intake Cones
Intake Cones are manufactured in various diameters and transitions as required.
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Self-Regulating Fan Covers
A simple configuration that bolts to the fan flange and automatically opens or closes with air flow from the fan.
Fan 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.
