joule HHH-AEHP-00001, Installation & Maintenance Manual

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Modul-Air System Sound Data
The given figures below are excluding any attenuator accessory. The use of attenuators is recommended to
reduce noise transmitted inside ventilation ductwork. With the Modul-AIR, depending on the frequency,
the in-duct sound power level can reduce by up to 25% (as seen in graph) through the use of the attenuator
accessory. In-room sound levels could also be reduced by as much as 50%.
Based on a ducting arrangement with 130Pa’s, @ 120m³/h c/w TRD25 Ø160mm 1m silencer.