Nailor Model 0722 Ceiling Dampers are for use in round applications, in lieu of hinged door sort dampers in almost any UL/ULC ground/ceiling or roof/ceiling assembly with as much as a 3 hour fireplace resistance ranking where by air ducts are allowed. You can also Management what information is saved in the account with https://brooksdwlan.blogsumer.com/36124256/how-dampers-for-industrial-sector-can-save-you-time-stress-and-money