Model Series 1220M and 1220M-three "three-in-1" Modulating Fireplace/Smoke Dampers have been engineered to deliver high quality containment in fire and smoke problems. The addition of volume Regulate utilizing a modulating actuator eradicates the need and value of the independent Regulate damper. See Product or service Particulars (2.0) equivalent laminated blade https://dantedukan.blogsumer.com/35974999/about-heavy-duty-stainless-steel-damper-manufacturers