RECTANGULAR DUCT SILENCER

SOUND SILENCER MODEL : RDS-H

Silencer Construction

Casing

    The outer shell of the silencer is constructed of solid sheet metal. This shell can be fabricated from various materials and range in thickness from 22 gauge to 10 gauge. A heavier gauge casing is often used to improve the transmission loss properties of the silencer, which reduces the amount of noise that can breakout through the walls of the silencer and enter into the occupied space. A heavier gauge material will also make the silencer more robust to provide resistance to the elements or other sources. Additional available casing materials are 304 and 316 stainless steel and aluminum.

Perforated Liner

    The perforated material on the interior of the silencer is specially designed to provide protection to the internal acoustic media, but is acoustically transparent, allowing sound energy to penetrate the acoustic materials. To be manufactured from a minimum 24 gauge perforated galvanized steel perforation with 2.0 mm. Diameter giving a minimum 29.6% open area.

Acoustic Media

    In absorptive silencers the acoustic media is the internal fibrous material that absorbs energy from the sound waves as they pass through the silencer. This shall be a glass fiber material in accordance with ASTM-C423. A polyester or mylar membrane can also be provided as required to minimize the ingress of dust or water into the infill.