36 in Backdraft Damper / Wall Shutter, 39-1/2 in x 39-1/2 in PRODUCTS_IMPORT zoro_no: G6273869

zoro_no: G6273869

zoro_no: G7445243

Allow Sealed Pressure Systems to Vent Off Excess Pressure as Heat in System Builds up

zoro_no: G5437439

Package Quantity 100 graingerSKU: 48WF91

36 in Backdraft Damper / Wall Shutter, 39-1/2 in x 39-1/2 in PRODUCTS_IMPORT zoro_no: G627386942 In. H W 5. 75 In. L Aluminum Wall Fan Shutter, Damper Application Backdraft, For Nominal Duct Diameter Not Applicable, Frame Material Aluminum, Number of Panels 1, Maximum Air Velocity 2500 fpm, Overall Height 42 in, Rough Opening Diameter 39 1 2 in, Rough Opening Shape Square, Fits Fan Diameter 36 in, For Duct Shape Not Applicable, Free Area 8. 5 sq ft, Overall Width 42 in, Frame Material Thickness 0. 8 in, Overall Length 5 3 4 in, Connection Type