Model 0540V Vast Frame Static Curtain Fire Damper is UL accredited to be used the place making codes have to have the defense of HVAC ductwork penetrations in vertical fire separations (partitions or partitions) that have a hearth resistant score of 4 hrs or significantly less. The 0540 is classified https://dampers-for-industrial-se79012.dgbloggers.com/37445850/how-dampers-for-industrial-sector-can-save-you-time-stress-and-money