Versions 1221-DOW and 1221-OW are "outside of wall" large performance blend fireplace/smoke damper particularly suitable for applications the place the damper can not be installed in the airplane from the wall or flooring. They capabilities Nailor’s distinctive inter-locking double pores and skin airfoil blade design that removes combustible seals and supplies flame and https://dampers-for-industrial-se12334.blogars.com/35743181/dampers-for-industrial-sector-options