The listed sizes refer to duct opening measurement
Made from durable powder coated steel
Provides a 360 degree air deflection
Screws included
The larger screw holes on the damper can be used for mounting to a duct boot
WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.p65Warnings.ca.gov