Heavy Duty Teardrop Design Formed Steel Blade Backdraft Damper

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Model:	BID4
Filter:	BID4
Minimum Panel Size:	12" x 12"
Maximum Panel Size:	48" x 72"
Frame Depth:	4" Deep
Frame Type:	Channel or Flanged
Frame Material:	10 ga. Galvanized Steel
Blade Type:	Tear Drop Design
Blade Material:	16 ga. Galvanized Steel
Blade Action:	Parallel
Blade Seals:	Polyurethane
Jamb Seals:	None
Axles:	¾" Diameter Steel, Full Length of Blade
Bearings:	Bronze Oilite
Linkage:	⅛" Thick Plated Steel Bracket with Plated Steel Pivot in Celcon Sleeve Bearings On-Blade
Counterweights:	Adjustable Range of Opening Pressures Assist or Retard
Maximum Temperature:	180°F
Finish:	Mill

Jamb Seals:	Low Leakage
Blade Seals:	Stainless Steel
Variety of Bird and Insect Screens