Model 0540V Vast Body Static Curtain Fireplace Damper is UL accredited for use where by setting up codes need the defense of HVAC ductwork penetrations in vertical fire separations (walls or partitions) which have a fire resistant ranking of four hours or much less. The 0540 is classed for use https://heavy-duty-stainless-stee13445.blogozz.com/35919524/not-known-details-about-dampers-for-industrial-sector