One of the exploitable way to reduce noise from ventilation fan is by applying Circular Silencer on to it. Being cylindrical, the silencer can be merely mounted with method of ‘on-fan' or ‘in-duct' type of applications. The usage and purpose of using this silencer is the same as their counterpart - duct silencer. However, circular silencer provide lesser pressure drop and the installation is fast. Noise from the fans travel in both direction - intake and discharge. It is important to install the Circular Silencer at both of these sides.

CONSTRUCTION
The casing of ISTIQ Circular Silencers are constructed from galvanized iron (G.I) sheet metal as our standard that resembles a piece of air conditioning ductwork. The inner casings are made of perforated (G.I) and acoustic infill that meets Class 0 in building regulation when tested in accordance to BS 476: Part 4: 1970 (1980), is placed in between them.

Different density and type of acoustic infill is used depending on the application to ensure excellent performance. The percentage of perforation of galvanized sheets, which hold the infill, was chosen to give the optimum overall insertion loss.

FEATURES
ISTIQ Circular Silencers are available in two different models - iP and iOP which is basically the silencer with pod and without pod respectively. Model iOP (without pod) is a straight trough design providing good acoustic performance with negligible pressure loss. For better performance, Model iP (with pod) is recommended in the application. Nevertheless the consideration of the pressure drop need to be taken into account cautiously

DIMENSIONS
ISTIQ Circular Silencers are available from 300 mm diameter upwards and are supplied with flange end for direct attachment to various type of fans. The length are available in two standard sizes which are 1D(diameter) length and 2D(diameter) length. However, other length are also available on request.

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