Model D1201-OW and D1201-DOW are "outside of wall" large overall performance dynamic fireplace dampers. They provide quality effectiveness as well as a low force drop compatible to the majority of business applications. Exceptional, inter-locking double skin blade style and design removes combustible seals and presents flame safety less than fire https://heavydutystainlesssteelda90111.actoblog.com/37838818/dampers-for-industrial-sector-fundamentals-explained