Nailor Product 0722 Ceiling Dampers are for use in round applications, in lieu of hinged doorway style dampers in almost any UL/ULC floor/ceiling or roof/ceiling assembly with approximately a three hour fireplace resistance ranking where by air ducts are allowed. Mestek, Inc. is actually a household of above 45 specialty manufacturers furnishing heating, ventilating, https://dampersforindustrialsecto24566.bloggactif.com/38449877/the-smart-trick-of-heavy-duty-stainless-steel-damper-manufacturers-that-nobody-is-discussing