Design 0540V Vast Body Static Curtain Hearth Damper is UL accepted for use the place making codes involve the defense of HVAC ductwork penetrations in vertical hearth separations (walls or partitions) that have a hearth resistant score of four hrs or less. The 0540 is classed to be used in https://dampersforindustrialsecto12344.like-blogs.com/36588252/the-2-minute-rule-for-dampers-for-industrial-sector