Models 1221-DOW and 1221-OW are "away from wall" substantial general performance mix fire/smoke damper especially suitable for applications in which the damper can not be installed inside the plane from the wall or floor. They functions Nailor’s unique inter-locking double pores and skin airfoil blade style that eliminates combustible seals and gives flame https://dampers-for-industrial-se35677.blogoxo.com/37094029/dampers-for-industrial-sector-an-overview