Documents Available


Setup and Operation Manual 

Applicable Part Numbers


  • 016-556-10 H2 Zero Return Air Damper Assembly
  • 016-555-10 H2 Zero Return Air Damper Assembly Unistrut Mounting Kit
  • 643-506-10 8” Diameter Galvanized Steel Collar


Product Description


Before installing the H2 Zero Return Air Damper, you need to plan where you will place the unit.

  • If possible, to simplify ductwork, it is recommended that this be an outside wall such that a straight 8” diameter duct can be installed. 
  • The wall must have sufficient strength to support 30 lbs. 
  • Clearance around the unit should be 18” on all sides except the mounting surface. 

If you need more information, please contact Comm/net Systems Support


Comm/net Systems Inc. Support

(206) 282-8670

or submit a support ticket through this portal.