Styles 1221-DOW and 1221-OW are "out of wall" large functionality mixture fireplace/smoke damper exclusively made for applications where by the damper can not be put in in the plane in the wall or ground. They attributes Nailor’s one of a kind inter-locking double skin airfoil blade style that eliminates combustible seals and supplies https://heavy-duty-stainless-stee89011.blogsuperapp.com/37618406/a-review-of-dampers-for-industrial-sector