Description
Heavy Duty Teardrop Design Formed Steel Blade Backdraft Damper Standard Materials and Construction
- FRAME: 10 GA. galvanized steel.
- BLADES: 16 GA. galvanized steel.
- BLADE SPACING: 3⅜” minimum to 7⅛” maximum
- LINKAGE: ⅛” thick plated steel bracket with ½” dia. plated steel pivot riding in a celcon sleeve bearing. Linkage rod is 5⁄16″ dia. aluminum locked to pivot with a ¼”-20 UNC plated steel set screw. Single linkage for panels < 20″W. double linkage for panels > 20″W.
- AXLES: ¾” dia. steel; Full length of blade.
- BEARINGS: Bronze Oilite.
- SEALS: Polyurethane on blade edges, none at jambs.
- FINISH: Mill.
