20" x 4" Aluminum Spiral Duct Air Vent Grille Cover - Fully Adjustable Double Deflection HVAC Air Supply [Outer Dimensions: 22w X 6"h] w16h16 Actual Filter Size – 11

Actual Filter Size – 11 3/4"w x 31 3/4" x 1"

+ Product Details Size - 8"w X 24"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 30 5/8" width X 14 5/8" height

actual front end outer dimensions are approximately 26 5/8" width X 14 5/8" height

production and finish on all products

20" x 4" Aluminum Spiral Duct Air Vent Grille Cover - Fully Adjustable Double Deflection HVAC Air Supply [Outer Dimensions: 22w X 6"h] w16h16 Actual Filter Size – 11+ 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.