10" x 10" [Duct Opening] Ceiling Supply Diffuser Vent Cover – 2-Way Airflow with Full Aluminum Frame, Back Blades & Opposing Blade Lever Damper [Outer Size: 13" x 13"] 18in diameter + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 24"w X 6"h Is The Size For The Duct Opening Measurement Only

Actual Filter Size – 17 3/4"w x 5 3/4" x 1"

+ Product Details Size – 40"w X 10"h is the size for the duct opening measurement only

+ Product Details Size - 28"w X 24"h is the size for the duct opening measurement only

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

10" x 10" [Duct Opening] Ceiling Supply Diffuser Vent Cover – 2 Way Airflow with Full Aluminum Frame, Back Blades & Opposing Blade Lever Damper [Outer Size: 13" x 13"] 18in diameter + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 24"w X 6"h Is The Size For The Duct Opening Measurement Only Actual Filter Size – 17 3 4"w x 5 3 4" x 1"