Triangle Fan Mounted Intake Gravity Damper Shutter 28 inch w/ Pull Chain RIWS21

Triangle Engineering 28 inch Fan Mounted Intake Gravity Damper w/ Pull Chain RIWS21-IWS155
Triangle Engineering
Build Time:
7 to 10 Business Days ?
Ships By:

Build Time

The product Build Time you see represented on this site is only a typical number of days the manufacturer states it needs to build the product(s) when ordered. Build times are based on business days (excludes weekends & holidays).

The build time does not include the time it will take to ship the order to you (the customer). If an order has multiple items and comes from multiple warehouses, you may receive part of your order on one day, and then receive the remaining part(s) of your order at a later date.

*Please be aware that seasonal demand of certain equipment may cause build times to run longer than what is typical.

LIST: $549.00
Only $324.63
Quantity Unit Price You Save
6-9 3%
10+ 5%

NOTE: Triangle Engineering Exhaust & Intake Shutters are Non-Returnable. 


Single Panel Supply Shutter 
Welded Galvanized Steel Frame 
Bronze Pivot Bushings 
Extruded Aluminum Blades 
Bronze finish, Polyester Powder Coated Frame 

Pull chain Included:

Outside Dimension: 30-3/8" square

Inside Dimension: 28" square

Depth: 4"

Please Note:

Supply shutters must be fully opened before starting fan. Requires mechanical operation.

Model No.:
RIWS21 -IWS155
Dampers, Shutters & Weather Hoods
Dimension Inches:
Width: 30-3/8" Depth: 4" Height: 30-3/8"
Weight lbs.:
Notice: Manufacturer's products features and specifications are subject to change without notice.
California Residents: warning WARNING- This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, please visit


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