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.

HVAC SILENCERS:

• Quiet-Duct Ultra™/Low – 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.

HVAC HEAVY DUTY SILENCERS:

IAC has more than five decades of experience in the design and manufacture of silencers for jet engines, gas turbines, forced draft fans and air handling systems. The result is an extensive range of standard silencer configurations incorporating innovative design and manufacturing features with performance certified in IAC’s Aero-Acoustic NVLAP-Certified Laboratory.

Performance ratings for both Dynamic Insertion Loss and Aerodynamic Pressure Drop for all Power-Flow Silencer designs have been certified in accordance with ASTM E477 and applicable sections of ISO 7235:1991 and British Standard 4718-1971 in our full-scale wind tunnel and corroborated by independent laboratories.

Some typical applications for Power-Flow Silencers include:

• Gas Turbines
  
• Compressors
  
• Diesel Engines
• Cooling Towers
  
• Mechanical Draft Fans
  
• Air Cooled Condensers
• Scrubbers
  
• Power Plants
  
• Wind Tunnels
• Dust collectors
  
• Furnace Exhaust
  
• Engine Test Cells
• Incinerators
  
• Refineries
  
• Steel Mills
• Test Facilities
  
• Tunnel Ventilation
  
• Jet Fans
• Chemical Process Plants
  
• …any Air/Gas Handling Installation
• IAC Power-Flow Stack Insert Silencers are available in 28 standard aero-acoustic designs to solve most stack noise problems. Special designs are developed in the IAC Aero-Acoustic Laboratory as may be required.
• Cost-Effective Silencing for Induced Draft Fan Systems:
• Scrubbers
  
• Paint Spray Facilities
• Precipitators
  
• Cupolas
• Heat Recovery Boil Stacks
  
• Coke Oven Emission Control Systems
  
• Industrial Ventilation Systems
  
• IAC Power-Flow ACoustic FIlter (ACFI) – Tuned Dissipative Silencers

IAC ACFI Silencers are designed to provide noise control for induced draft fans in power plants, ventilation system in steel mills, coal mines, aluminum reduction facilities, and other processes that involve gas streams which often contain appreciable amounts of moist particulate which can quickly clog and render conventional parallel baffle absorptive silencers ineffective.

Take advantage of IAC’s know-how…the most extensive in the noise control industry. Special silencer configurations are available to satisfy the most stringent criteria.

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