Model 0540V Large Frame Static Curtain Fire Damper is UL accepted to be used in which developing codes call for the defense of HVAC ductwork penetrations in vertical hearth separations (walls or partitions) which have a fire resistant rating of 4 hours or considerably less. The 0540 is classified to https://elliothzqer.frewwebs.com/37510000/5-essential-elements-for-dampers-for-industrial-sector