12" x 12" [Duct Opening] Ceiling Supply Diffuser Vent Cover – 4-Way Airflow with Full Aluminum Frame, Back Blades & Opposing Blade Lever Damper [Outer Size: 15" x 15"] Compatible with Duct 10" + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 40"W X 8"H is (for duct opening measurement only)

The temperature range is -4° to 230°F

+ Product Details Size – 10" x 28" or 28" x 10" is the size for the duct opening measurement only

The plastic material offers a lightweight solution to any project

+ Product Details Size – 28"w X 26"h is the size for the duct opening measurement only

12" x 12" [Duct Opening] Ceiling Supply Diffuser Vent Cover – 4 Way Airflow with Full Aluminum Frame, Back Blades & Opposing Blade Lever Damper [Outer Size: 15" x 15"] Compatible with Duct 10" + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 40"W X 8"H is (for duct opening measurement only) The temperature range is 4° to 230°F