12"W X 4"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 13.75"W X 5.75"H] Round To Oval Straight Boot effectively capturing dirt and particles Compatible with Duct 4" Product Details Size 32 LO246

effectively capturing dirt and particles such as pollen

Actual Filter Size – 19 3/4"w x 21 3/4" x 1"

+ Product Details Size - 26"w X 36"h is the size for the duct opening measurement only

+ Product Details Size & Compatibility – The 4" galvanized steel round side take-off is compatible with duct 4"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 22" x 18" OR 18" x 22" duct opening (measured at the opening)

12"W X 4"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 13.75"W X 5.75"H] Round To Oval Straight Boot effectively capturing dirt and particles Compatible with Duct 4" Product Details Size 32 LO246 effectively capturing dirt and particles such as pollen Actual Filter Size – 19 3 4"w x 21 3 4" x 1"