Material Compatibility: Butterfly valves Possess a Substantially broader material variety, resulting from The variability of fluids They're exposed to. Design 0540V Extensive Frame Static Curtain Fire Damper is UL authorized for use where setting up codes require the security of HVAC ductwork penetrations in vertical fireplace separations (walls or partitions) https://heavydutystainlesssteelda90123.angelinsblog.com/36075878/dampers-for-industrial-sector-secrets