Product 0540V Wide Frame Static Curtain Hearth Damper is UL authorized to be used in which building codes demand the security of HVAC ductwork penetrations in vertical fireplace separations (partitions or partitions) which have a fireplace resistant score of four hours or much less. The 0540 is classified to be https://alexisgyncq.develop-blog.com/44286088/the-2-minute-rule-for-dampers-for-industrial-sector