The Model 4000 series control damper is specially
engineered so that the frame locks together without bolts, screws and rivets that can vibrate loose. Its design allows it
to be used in either an exhaust or intake system. The damper blade pivots in the middle, which makes it easier to open, by
balancing the positive and negative pressure on both sides of the blade. With its non-corrosive bearings, lock together frame
and shake proof linkage the 4000 series is very low maintenance and will ensure a long life.
Construction
Depth Blades Closed:
5" (127 mm)
Depth Blades Open:
6 3/8" (162 mm)
Material: Galvanized
Steel
Frame: 16 guage
continuous galvanized steel hat channel reinforced with corner braces
Blade Style: 4000-OB
Opposed Blade
4000-PB
Parallel Blade
Blade Thickness:
16 gauge galvanized steel
Bearings: Molded
Synthetic
Axles: 3/8" Plated
Bar
Frame Styles: Duct
Mount
Minimum Height: 8" (203
mm) Single Blade
14"
(356 mm) Double Blades
Maximum Panel Height:
72" (1829 mm)
Maximum Panel Width: 48"
(1219 mm)
Maximum System Pressure: 4"
w.g.
Linkage: Concealed
in frame
Standard Finish: Mill
Galvanized
Standard Motor Installation:
Side shaft direct drive, extendable up to 12"
Operating Temperature Range:
-25 to +180 Degrees F 
