Pressure Drop Data - Greenheck Steel Airfoil Blades OFSD-311 Specification Sheet
Out of wall combination fire smoke dampers steel airfoil blades ul 555s leakage class i ul555 1 1/2 hour fire resistance rating horizontal or vertical mount
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Also See for Steel Airfoil Blades OFSD-311:
Out of wall combination fire smoke dampers steel 3v blades ul 555s leakage class ii ul555 1 1/2 hour fire resistance rating horizontal or vertical mount (6 pages)