Types 1221-DOW and 1221-OW are "out of wall" large efficiency blend fire/smoke damper especially designed for programs wherever the damper can not be put in inside the airplane in the wall or flooring. They characteristics Nailor’s special inter-locking double skin airfoil blade structure that removes combustible seals and supplies flame and smoke seal https://dampersforindustrialsecto24456.losblogos.com/35981625/a-secret-weapon-for-dampers-for-industrial-sector