Quiet-Duct® rectangular silencers are available for conventional applications including low-frequencies. IAC's range has an acoustic performance specifically engineered for the 63Hz, 125Hz and 250Hz octave bands. Through over half a decade of innovation, our pioneering range of duct silencers are among the highest performing models available.
Our Quiet-Duct® Rectangular Attenuators are in use in many different markets and applications that include:
IAC has been manufacturing Quiet-Duct® attenuators for over 50 years, installing thousands of units each year. We test all of our products in our own R&D laboratories to ensure each attenuator provides the correct acoustic performance levels. As a result, all IAC Acoustics Quiet-Duct® silencers provide a guaranteed acoustic performance.
We offer a wide range of Quiet-Duct® attenuators, however, if you have a special requirement, please get in touch.
IAC has many different ranges of Quiet-Duct® rectangular attenuators such as:
IAC's Rectangular duct attenuators have many different features such as:
The outer casings of rectangular duct silencer modules are made from galvanised steel in accordance with HVAC DW 144 and ASHRAE GUIDE recommended construction for medium pressure rectangular duct work. The seams of the Quiet Duct Attenuator are lock formed and mastic filled.
Internal acoustic elements of rectangular silencers incorporate integral die formed evase entry and exit to minimise pressure drop and self-noise. Interior partitions for rectangular silencers are made of no less than 26 gauge (0.46mm) galvanised perforated steel.
The filler material is inorganic mineral or glass fibre, which is of a density sufficient to obtain the specified acoustic performance and is packed under no less than 5% compression to eliminate voids due to vibration and settling. Materials are inert, vermin and moisture proof.
Combustion rating for the Quiet Duct Attenuator acoustic fill is no greater than the following when tested in accordance with ASTM E84, NFPA Standard 255 or UL No. 723.
Attenuator ratings are determined in a duct-to-reverberate room test facility that provides for airflow in both directions through the test silencer in accordance with applicable sections of ASTM E 477, ISO 7235:1991 and BS 4718-1971. The test set-up and procedure is such that all effects due to end reflection, defectively, flanking transmission, standing waves and test chamber sound absorption are eliminated. Acoustic ratings include Dynamic Insertion Loss (DIL) and Self-Noise (SN) Power Levels both Forward Flow and Reverse Flow with airflow of at least 10m/s entering face velocity