Product Sequence 1220M and 1220M-3 "3-in-1" Modulating Fireplace/Smoke Dampers have already been engineered to deliver top quality containment in hearth and smoke circumstances. The addition of volume Command using a modulating actuator gets rid of the need and price of the separate Management damper. View Merchandise Details Product Series 1220 https://dampers-for-industrial-se02222.blogs100.com/37404536/dampers-for-industrial-sector-options