Design D1201-OW and D1201-DOW are "from wall" higher overall performance dynamic fireplace dampers. They provide top quality overall performance along with a reduced force fall well suited to the majority of professional apps. Exclusive, inter-locking double skin blade style and design gets rid of combustible seals and offers flame safety https://dampers-for-industrial-se80123.blogpixi.com/37276892/the-5-second-trick-for-dampers-for-industrial-sector