Models 1221-DOW and 1221-OW are "out of wall" higher functionality mixture fire/smoke damper especially made for programs in which the damper can't be set up throughout the plane on the wall or ground. They functions Nailor’s unique inter-locking double skin airfoil blade style and design that removes combustible seals and supplies flame and https://dampersforindustrialsecto91345.snack-blog.com/36902765/5-essential-elements-for-dampers-for-industrial-sector