Types 1221-DOW and 1221-OW are "out of wall" substantial efficiency mix fire/smoke damper exclusively designed for programs where by the damper cannot be put in throughout the airplane in the wall or flooring. They features Nailor’s special inter-locking double pores and skin airfoil blade design that removes combustible seals and delivers flame and https://heavydutystainlesssteelda78899.blogchaat.com/37199389/everything-about-dampers-for-industrial-sector