20" x 4" Aluminum Spiral Duct Air Vent Grille Cover - Fully Adjustable Double Deflection HVAC Air Supply [Outer Dimensions: 22w X 6"h] d Actual Filter Size – 21

Actual Filter Size – 21 3/4"w x 25 3/4" x 1"

and versatile for any project

+ Product Details High Quality - Aluminum housing on the outside and on the inside for the best insulation value

actual front end outer dimensions are approximately 12 5/8" width X 36 5/8" height

20" x 4" Aluminum Spiral Duct Air Vent Grille Cover - Fully Adjustable Double Deflection HVAC Air Supply [Outer Dimensions: 22w X 6"h] d Actual Filter Size – 21+ Product Details Size 20"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are 22" width X 6" height. Design 180 degrees double direction adjustable fins are manually adjustable individually for optimal air distribution. High Quality Commercial grade aluminum will never rust designed for warehouses, factories, workshops, gymnasiums & restaurants Airflow Easy unrestricted airflow for your HVAC system.