IAC Silencers have been rated with procedures certified in accordance with applicable portions of ASTM E 477. All Dynamic Insertion Loss and Self-Noise Acoustic Performance Data were obtained in IAC's Aero-Acoustic Laboratory using the duct-to-room reverberant test facility with air flowing through the silencers. IAC America offers the broadest range of silencers/louvers in the industry. All of IAC’s silencers were developed in response to specific requirements from acoustical consultants, consulting engineers, owners, and contractors. Having been pre-tested for performance, they provide the most economical choices for solving the wide variety of noise control problems encountered in HVAC engineering.

Silencer Applications:

– For conventional applications where guaranteed performance is required down to 31.5 Hz, including finer resolution of one-third-octave-band data for applications requiring full octave band performance to match specific sound sources.

* Quiet-Duct Ultra™/Green – A 100% environmentally friendly attenuation solution. Silence is achieved through the use of recycled acoustic fill material. Ideal for any clean and green application.

* Quiet-Duct Ultra™/ZAPD – For applications in which acoustic attenuation is required and no allowance can be made for pressure loss. A Zero-Added-Pressure-Drop silencer is ideal of high velocity systems or systems that have little or no room for additional pressure drop.

* Quiet-Duct Commercial Series – For conventional applications including low frequency. Silencers are specifically engineered to enhance insertion loss in the 63 Hz, 125 Hz, and 250 Hz octave bands.

* Clean-Flow Rectangular Silencers – For systems requiring a higher degree of cleanliness and hygiene such as in hospitals or clean rooms. Linings on the fill material guard against erosion of particulate matter into the air-stream. Specific internal construction features protect the lining against chafing or premature failure and are necessary to maintain the rated aero-acoustic performance.

* Conic-Flow Tubular Silencers – For silencer applications including low frequency. Silencers are specifically engineered to enhance insertion loss in the 63 Hz, 125 Hz, and 250 Hz octave bands.

* D-Duct™ Acoustic Diffuser Silencers – For use on axial-fan systems. The combined interior diffuser cone and exterior square jacket casing make these units aerodynamic-regain devices as well as silencers.

* Ultra-Pals™ Rectangular Packless Silencers – The ultimate solution for ultra-clean environments and corrosive/flammable environments. The complete absence of fill makes Ultra-Pals™ Rectangular Packless Silencers ideally suited for any application where particulate matter or fiber erosion from conventional fill materials could contaminate the air/gas streams. The complete absence of fill combined with ease of cleaning and draining, makes Ultra-Pals™ Silencers ideal in corrosive/flammable environments and for facilities handling gasoline, grease, solvents, and other hazardous materials.

* Ultra-Pals™ Tubular Packless Silencers – For small-diameter circular duct systems such as fume hoods. Additionally, the packless design of these units makes them equally applicable to the types of systems mentioned for the Rectangular Ultra-Pals™ Silencers.

* Acoustic Louvers – Twelve inch deep model “R” and model “LP” louvers allow for ventilation while reducing noise transmission from building machine rooms. Four inch and six inch Slimshield™ models are compact for use in walls, doors, or equipment enclosures where airflow is required.