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Backdraft Damper Vert/Horiz Mtg 19 3/4Sq
19.8 In.H-W 4.5 In.L Alu Spring Bkdrft Dampr Damper Application Backdraft For Nominal Duct Diameter 20 in Frame Material Galvanized Steel Number of Panels 1 Maximum Air Velocity 2000 fpm Overall Height 19 3/4 in Rough Opening Diameter 20 in Rough Opening Shape Square Fits Fan Diameter 20 in For Duct Shape Square Free Area 2.5 sq ft Overall Width 19 3/4 in Frame Material Thickness 20 ga Overall Length 4 1/2 in Frame Depth 2 in Rough Opening Length 20 in Maximum Pressure 1 in wc
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19.8 In.H-W 4.5 In.L Alu Spring Bkdrft Dampr Damper Application Backdraft For Nominal Duct Diameter 20 in Frame Material Galvanized Steel Number of Panels 1 Maximum Air Velocity 2000 fpm Overall Height 19 3/4 in Rough Opening Diameter 20 in Rough Opening Shape Square Fits Fan Diameter 20 in For Duct Shape Square Free Area 2.5 sq ft Overall Width 19 3/4 in Frame Material Thickness 20 ga Overall Length 4 1/2 in Frame Depth 2 in Rough Opening Length 20 in Maximum Pressure 1 in wc
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