Designs 1221-DOW and 1221-OW are "outside of wall" higher general performance mixture hearth/smoke damper particularly created for purposes in which the damper can not be mounted within the aircraft of the wall or floor. They capabilities Nailor’s distinctive inter-locking double skin airfoil blade structure that eliminates combustible seals and supplies flame and smoke https://dampersforindustrialsecto80122.popup-blog.com/35960854/5-essential-elements-for-dampers-for-industrial-sector