Standard construction
Frame: 8"x11/4"x16ga. galvanized steel channel
Flange: Corner 0.4" dia. x 8 EA for installation bolt holes.
Blades: 22"Ga. galvanized steel upto 36" length.
22"Ga. galvanized steel upto 48" length
Min blade dimension: 6"
Linkage: Concealed in frame or face linkage inside of air stream.
Bearings: sleeve bearing
Axles: 1/2" dia. galvanized steel.
MIN. Damper size: PB single blade-5" W x 4" H
MAX. Section size: 48" x 72"
MAX. damper size: 72" x 72"
Steel construction: welded constructions
Axles: bolted to blade and tag welded.
Finish: Galvanized steel zinc plated hardware.

Installation instruction
Air flow rate control between duct and duct bolt conection

Variations(at extra charge)
1. Special finish
2. Special material: alum., stainless steel, etc.
3. Special blade seals and axle shaft seals
4. Special thickness of blade or frame.