Model 0540V Wide Body Static Curtain Hearth Damper is UL accredited to be used wherever setting up codes call for the defense of HVAC ductwork penetrations in vertical fire separations (walls or partitions) which have a fire resistant score of 4 hrs or less. The 0540 is assessed for use https://andyphxlz.myparisblog.com/37519944/getting-my-heavy-duty-stainless-steel-damper-manufacturers-to-work