Types 1221-DOW and 1221-OW are "out of wall" high performance mix fireplace/smoke damper specially suitable for purposes in which the damper can't be installed within the aircraft on the wall or ground. They functions Nailor’s unique inter-locking double pores and skin airfoil blade design and style that removes combustible seals and delivers flame https://heavydutystainlesssteelda90011.bloggerchest.com/36876978/dampers-for-industrial-sector-for-dummies