IAC’s Power-Flow Silencers for heavy duty air and gas handling equipment satisfy the most rigorous acoustic, aerodynamic, thermal and mechanical performance requirements. The quality and performance of IAC silencers are field tested and proved in thousands of installations throughout the world.
There is a modular rectangular or tubular IAC Power-Flow Silencer, engineered to your specific needs, to solve the noise problems of every heavy-duty gaseous flow system.
Performance Ratings for both Dynamic Insertion Loss and aerodynamic pressure drop for all Power-Flow Silencer designs have been certified by tests in our fully equipped laboratory and corroborated by independent laboratories.
- Gas Turbines
- Diesel Engines
- Cooling Towers
- Mechanical Draft Fans
- Air Cooled Condensers
- Power Plants
- Wind Tunnels
- Test Facilities
- Dust Collectors
- Steel Mills
IAC Acoustics’ NVLAP-Rated Laboratory
Given today’s highly specialized markets, it is essential that an engineering and manufacturing organization operate its own development and test facilities to advance the existing technology and assure the quality of its products.
IAC America’s labs are accredited for nine tests under the National Institute of Standards and Technology National Voluntary Laboratory Accreditation Program (NVLAP). IAC’s research and development team continuously designs new products and re-engineers existing products to address unique noise-control requirements. The IAC laboratory provided a major impetus for the ASTM standard method of testing (E477-99) for prefabricated silencers. All IAC silencers are tested in accordance with applicable portions of the ASTM,British, and International Industry Standards.
Forward and Reverse Flow
In 1972, IAC developed silencer Dynamic Insertion Loss and Self-Noise ratings both under FORWARD FLOW (+) and REVERSE FLOW (-) conditions for Rectangular and Cylindrical Duct Attenuators. Since attenuation values are generally higher in the first five octave bands in the Reverse Flow (-) mode compared to the Forward Flow (+) mode, more economical silencer selections can often be made on return air systems. These phenomena are illustrated below.
Forward Flow occurs when air and sound waves travel in the same direction, as in an air conditioning system or fan discharge. Under forward flow conditions, high frequency sound is refracted into the duct silencer walls.
Reverse Flow occurs when air and sound waves travel in opposite directions, as in a typical return-air system. Under reverse flow conditions, sound is refracted away from the walls and towards the center of the duct silencer.
Power Flow Rectangular Silencers
Power-Flow silencers are available in any size required for your applications. Assemblies as large as 25’ high x 250’ wide are in continuous operation. Special silencer configurations available to meet the most demanding insertion loss and low self noise requirements. Silencers in light gauge construction also available.
Power Flow Tubular Silencers
Power-Flow silencers are custom sized to fit any application. Assemblies as large as 20' in diameter are in continuous operation. Special silencer configurations available to meet the most demanding insertion loss and low self noise requirements. Silencers in light gauge construction are also available.