Commercial Products

Absorptive Silencers

VAW Systems’ RSA (Rectangular), REA (Elbow), and CSA (Circular) silencers are specifically designed for noise control in commercial HVAC air distribution systems and industrial ventilation systems. These products provide a broad-band range of attenuation using aerodynamically shaped acoustic baffles filled with absorptive acoustic grade media. With radius inlets and tapered outlets, maximum attenuation at the lowest possible pressure loss is assured. Features include:
  • Inlet and outlet connections matched to actual duct dimensions to avoid the need for transitions
  • Excellent balance between acoustic and aerodynamic performance
  • May be assembled in a modular fashion and/or sized to meet shipping and handling requirements


  • Supply and return air systems
  • Close coupled fan plenums and air handling units
  • Roof top air handling systems
  • Plant and generator room ventilation
  • Exhaust openings from manufacturing and industrial facilities
  • Ventilation for acoustic equipment enclosures
  • Air conditioning installations and cooling towers


  • Support brackets
  • Airflow probes
  • Access doors
  • Drainage connections
For special applications, such as high temperature, corrosive, or high pressure systems, consider VAW’s Industrial Silencer product line.

Standard Features

  • Casing: 22 ga. galvanized steel
  • Internals: 22 ga. galvanized perforated steel with stiffeners and acoustic grade fiberglass media fill
  • Constructed in accordance with ASHRAE® and SMACNA® standards

Standard Rectangular and Elbow Size Ranges

  • 6 in. to as required connection width dimension
  • 6 in. to as required connection height dimension
  • 36 to 144 in. long casings

Standard Circular Size Ranges

  • 6 to 72 in. diameter connection dimension
  • 36 to 120 in. long casings
  • Casing outside walls ≥ connection ID

Construction Options

  • Heavy casings (HTL): 10 to 20 ga. steel
  • Casing materials: Stainless (304 & 316), Satin Coat Aluminum, and HRS with paint finish
  • Flange configurations and materials
  • Cotton media fill
  • Custom configurations for space and weight restrictions
  • Transitional (unequal inlet and outlet dimensions)
  • Special paint system
  • Extended casings for higher velocities and enhanced attenuation – (EH & EW)
  • Fiberglass cloth and protective lining
  • Special shipping splits
  • Removable baffles, center body and side panels