Styles 1221-DOW and 1221-OW are "out of wall" high performance mixture fire/smoke damper specially suitable for programs where the damper can't be put in within the plane with the wall or floor. They characteristics Nailor’s one of a kind inter-locking double skin airfoil blade layout that removes combustible seals and presents flame and https://martinshwkw.yomoblog.com/43640614/the-dampers-for-industrial-sector-diaries