Designs 1221-DOW and 1221-OW are "from wall" high general performance mixture hearth/smoke damper particularly created for purposes in which the damper can not be installed inside the aircraft of your wall or floor. They characteristics Nailor’s unique inter-locking double skin airfoil blade layout that eradicates combustible seals and offers flame and smoke seal https://dampers-for-industrial-se13466.actoblog.com/37824724/dampers-for-industrial-sector-an-overview