Round Single Blade Control Damper with Seals

The 250SRD (Sealed Round Damper) is designed for low leakage applications up to 6″ W.G. and 3000 FPM.

Rolled ribs in the galvanized steel frame provide greater reinforcement, ease of installation, and sealing joint.

Formed, galvanized steel angle stops are mechanically fastened to the frame to prevent over-rotation of the blade.

Model:	250SRD
Minimum Diameter:	4″
Maximum Diameter:	24″
Frame Depth:	7½”
Frame Type:	Round with Reinforcing Ribs
Frame Material:	22 Ga. Galvanized Steel
Blade Type:	Single Blade; Double Thickness
Blade Material:	20 Ga. Galvanized Steel
Blade Seal:	1/16″ Thick Neoprene Rubber Riveted to Blade with 20Ga. Galvanized Steel Retaining Plate
Shaft:	½” Diameter Plated Steel Stub, Mono-Bolted to Blade
Bearing:	Bronze Oilite Flanged Sleeve, Press Fit to Frame
Temperature Limit:	250°F
Operating Conditions:	Up to 6″W.G. and 3000 FPM
Finish:	Factory Mill
Max Static Pressure:	6″ W.G.
Max Velocity:	3000fpm

*Dampers smaller than minimum frame size require transitions.

Description

FRAME: 22 GA. galvanized steel, 7½” deep with reinforcing ribs.
BLADE: 20 GA. galvanized steel, double thickness.
SHAFT: ½” dia. plated steel stub, mono-bolted to blade. Extends 6” beyond frame.
BEARINGS: Bronze oilite flanged sleeve, press fit to frame.
STOPS: Formed galvanized steel angle mechanically fastened to the frame to prevent over rotation of the blade.
SEALS: ¹⁄16” thk. Neoprene rubber, riveted to the blade with a 20 GA. galvanized steel retaining plate.
TEMP LIMIT: 250°F.
FINISH: Mill.