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27 In.H-W 6.5 In.L Fiberglass Backdraft Damper, Damper Application Backdraft, For Nominal Duct Diameter Not Applicable, Frame Material Fiberglass, Number of Panels 1, Maximum Air Velocity 2500 fpm, Overall Height 27 in, Rough Opening Diameter 24 1/2 in, Rough Opening Shape Square, Fits Fan Diameter 24 in, For Duct Shape Not Applicable, Free Area 3.3 sq ft, Overall Width 27 in, Frame Material Thickness 0.1 in, Overall Length 6 1/2 in, Connection Type Not Applicable, Frame Depth 3 in
39 In.H-W 6.5 In.L Fiberglass Backdraft Damper, Damper Application Backdraft, For Nominal Duct Diameter Not Applicable, Frame Material Fiberglass, Number of Panels 1, Maximum Air Velocity 2500 fpm, Overall Height 39 in, Rough Opening Diameter 36 1/2 in, Rough Opening Shape Square, Fits Fan Diameter 36 in, For Duct Shape Not Applicable, Free Area 7.4 sq ft, Overall Width 39 in, Frame Material Thickness 0.1 in, Overall Length 6 1/2 in, Connection Type Not Applicable, Frame Depth 3 in
4142 Alloy Steel Rectangular Bar, Material Alloy Steel, Material Grade 4142, Thickness 0.3125 in, Thickness Tolerance +/-0.001 in, Overall Length 18 in, Overall Width 3 1/2 in, Fabrication Hot Rolled, Heat Treatable Yes, Heat Treatment Pre-Hardened, Mechanical Finish Mill, Yield Strength Not Rated, Tensile Strength Not Rated, Brinell Hardness 187, Rockwell Hardness B94, Machinability 50 Percent, Standards ASTM A322, Appearance Metallic, Includes Material Certificate Yes, Shape Rectangular Bar
4142 Alloy Steel Rectangular Bar, Material Alloy Steel, Material Grade 4142, Thickness 0.3125 in, Thickness Tolerance +/-0.001 in, Overall Length 18 in, Overall Width 3 in, Fabrication Hot Rolled, Heat Treatable Yes, Heat Treatment Pre-Hardened, Mechanical Finish Mill, Yield Strength Not Rated, Tensile Strength Not Rated, Brinell Hardness 187, Rockwell Hardness B94, Machinability 50 Percent, Standards ASTM A322, Appearance Metallic, Includes Material Certificate Yes, Shape Rectangular Bar