Silencer

Construction
Casings are of rolled, pre-galvanised sheet steel with spun end rings incorporating tapped inserts for ﬁxing. Suitable ﬁxing screws are provided with all steel silencers. The absorbent material is acoustic grade mineral ﬁbre with an erosion resistant facing. It is protected and contained by a pre-galvanised perforated sheet formed to match the fan diameter.

Cylindrical silencers shall be suitable for air pressures up to a maximum of 1000 Pa. For duct pressures in excess of 1000 Pa. please enquire.

A Melinex Lining (variant code M) can be supplied for critically clean applications such as hospitals to ensure no ﬁbre migration. The lining may also be used in moisture or grease laden conditions, such as kitchen extract systems where material is used in the ingress of grease etc. into the acoustic media. The use of the lining also allows the silencers to be low pressure steam cleaned. Some reduction of attenuation due to the lining will be experienced.

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Description

Size Range
Type B silencer bore diameters range from 280 mm to metric range, 6”anges5” imperial range in lengths equal to or twice the bore diameter (1D or 2D) 6” to 9.5” are available in 1.5D lengths only. Pressure loss for type B silencers is the same as a plain duct.
Type C silencers have a centrally mounted absorbent pod in the airway for increased attenuation. The pressure loss due to the pod is shown on the chart below. The diameter range is 315 mm to 2000 mm metric range or 12” to 75” imperial range.

Fume Handling
Stainless Steel, PVC or Polypropylene construction is also available for corrosive atmospheres. Please send details of the application with the enquiry.

Finishes
Standard ﬁnish is galvanised zinc coating Other ﬁnishes including epoxy paint are available to special order.

Mounting
Galvanised steel mounting feet, anti-vibration mounts and matching ﬂanges corresponding to those supplied for Aerofoil fans are available.