8"W X 14"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 9.75"W X 15.75"H] Curved Blade Steel + Product Details Size - LO246 Product Details Size 32 Compatible with Duct 4"

+ Product Details Size - 44"W X 4"H is (for duct opening measurement only)

+ Product Details Size - 24"w X 34"h is the size for the duct opening measurement only

Actual Filter Size – 35 3/4"w x 15 3/4" x 1"

+ Product Details Size & Compatibility – The size of sheet metal pipe is 18" round x 10' long

8"W X 14"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 9.75"W X 15.75"H] Curved Blade Steel + Product Details Size LO246 Product Details Size 32 Compatible with Duct 4" + Product Details Size 44"W X 4"H is (for duct opening measurement only) + Product Details Size 24"w X 34"h is the size for the duct opening measurement only