Arzel Zoning's InsertaDamper is a unique retrofit zoning solution for use in counterflow slab applications as well as round duct takeoffs. The contractor makes an access hole in the trunk and places the dampers into each run. The InsertaDamper is held in place by a patented internal damper clamp.

With the InsertaDamper, contractors can avoid cuts in walls and ceilings which means less mess and less installation time.