🔇 ASTM E477 Duct Silencers (Dynamic Insertion Loss DIL 63Hz-8kHz, Airflow ΔP " WC)

HVAC Duct Sound Attenuator Calculator

Size rectangular, circular, and elbow duct sound attenuators (Vibro-Acoustics / Price Industries) under ASTM E477 & AHRI 260: calculate octave-band Dynamic Insertion Loss (DIL dB from 63 Hz low-frequency fan rumble to 8,000 Hz blade pass noise), verify low regenerated air jet face velocity noise (<1,200 FPM), static pressure drop, and HVAC margins.

1. Project & Operating Inputs

Duct Silencers Installed (Silencer Count e.g. 24 Supply/Return Silencers)

Airflow per Silencer (CFM e.g. 6,500 CFM Air Delivery)

Customer Bid Price for Supplied & Connected Duct Silencers ($ / Unit)

Dissipative/Packless Silencers, Perforated Baffles, Sheet Metal Labor ($)

2. Financial Breakdown & Yield

ASTM E477 DUCT SILENCERS

Turnkey Duct Silencer Package Profit

Acoustic HVAC Contractor Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost