Models 1221-DOW and 1221-OW are "out of wall" superior efficiency mix fire/smoke damper exclusively designed for programs wherever the damper cannot be set up in the airplane from the wall or floor. They capabilities Nailor’s unique inter-locking double skin airfoil blade layout that eradicates combustible seals and offers flame and smoke seal beneath https://codyoftgu.blogofchange.com/37710353/the-definitive-guide-to-heavy-duty-stainless-steel-damper-manufacturers