Commercial Products

Lined Silencers

VAW Systems’ RSL (Rectangular), REL (Elbow) and CSL (Circular) lined silencers are specifically designed for air systems that prohibit any exposed fibers.  Our Technology helps ensure that fibrous media does not enter the airstream, with no significant silencer performance degradation as found with typical lined silencers.  In addition, this product may be applied to systems with other Indoor Air Quality concerns, such as moisture, particulate matter and other contaminates. Features include:
  • Class 1 category assembly for Flame Spread Index and Smoke Developed, when tested in accordance to UL 723 (ASTM E84), meeting the NFPA 90A maximum requirements
  • 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


  • Health Care Facilities
  • Laboratories
  • Educational Facilities
  • Air intakes at critical building openings
  • Roof top air handling systems

Standard Features

  • Casing: 22 ga. galvanized steel
  • Internals: 22 ga. galvanized perforated metal liner
  • 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

  • High Transmission Loss (HTL) casings: ¼ in plate to 16 ga. steel
  • Casing materials: Stainless (304 & 316), Satin Coat, Aluminum and HRS with paint finish
  • Flange configurations and materials
  • Cotton media
  • 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)
  • Special shipping splits
  • Removable baffles, center body and side panels
  • Wire mesh/bird screen protection