Product 0540V Huge Frame Static Curtain Fire Damper is UL authorised to be used in which setting up codes require the protection of HVAC ductwork penetrations in vertical hearth separations (walls or partitions) that have a hearth resistant ranking of 4 hrs or considerably less. The 0540 is classified to https://dampersforindustrialsecto79011.bloggip.com/37011048/the-smart-trick-of-heavy-duty-stainless-steel-damper-manufacturers-that-nobody-is-discussing