Design Collection 1220M and 1220M-three "three-in-one" Modulating Fire/Smoke Dampers have been engineered to deliver quality containment in fireplace and smoke circumstances. The addition of volume Command utilizing a modulating actuator eliminates the need and price of a separate Handle damper. View Item Details Design 1290F is an economical real round https://fireratedductworth78900.blogrelation.com/43188551/the-fact-about-dampers-for-industrial-sector-that-no-one-is-suggesting