Industrial Single Thickness Formed Steel Blade Control Damper

Stuffing boxes and replaceable packing
Jamb Seals – Stainless steel
Blade Edge Seals – Neoprene
Flanges other than the standard 2” wide, up to 3½”
Finishes – Acrylic, baked enamel, etc.
Perimeter holes: one flange or two flanges
External linkage
Other types of bearings
Materials – Full stainless steel construction, extruded aluminum, galvanized steel, etc.

Model:	421 / 422 / 423
Minimum Panel Size:	6″ x 6¾” (Single Panel) 6″ x 15″ (Opposed Blade)
Maximum Panel Size:	48″ x 96″ without Seals 48″ x 72″ with Seals
Frame Depth:	10″ Deep
Frame Type:	Formed Channel
Frame Material:	12 ga. Galvanized Steel
Blade Type:	Single Thickness
Blade Material:	12 ga. Galvanized Press Formed Welded to Shaft 6¾” to 9¾” Wide
Blade Action:	Parallel or Opposed
Shafts:	½” Diameter Corrosion Resistant Plated Cold Finished Steel Stub Drive Blade to bo Continuous Length
Bearings:	Bronze Oilite Flanged Sleeve Presd into Frame
Linkage:	Chevron Type Formed Bracket ⅛” Thick Steel with Trunnion Pivot Fastener In-Jamb or On-Blade
Finish:	Mill
Maximum Temperature:	250°F
Max Static Pressure:	6″ in w.g. (421) 8″ in w.g. (422) 10″ in w.g. (423)
Max Velocity:	2500fpm

*Dampers smaller than minimum frame size require transitions.

Description

FRAME: 2” x 10” x 2”, 12 GA. galvanized steel formed channel frame, mechanically fastened together.
BLADE: 12 GA. galvanized steel, form pressed single thickness, to a maximum 48” length, welded to blade shaft. Blade width is a minimum 6¾” and a maximum of 9¾”.
SHAFT: ½” dia. plated cold-finished steel, corrosion resistant, for up to 48” in length. Drive blade to be continuous in length.
BEARINGS: Bronze oilite flanged sleeve, pressed into the frame.
LINKAGE: ⅛” thk. chevron-type formed steel bracket. Trunnion is a plated steel machined pivot with a ⁵⁄16” dia. rod.
FINISH: Mill.
TEMP. LIMIT: 250°F. Consult the factory for temperature limits over 250°F