20"W X 14"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 21.875"W X 15.875"H] Compatible with Duct 10" Actual Filter Size – 7 Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

Actual Filter Size – 7 3/4"w x 13 3/4" x 1"

Ideal for Walls & Ceilings: Designed for seamless installation in standard 30" X 6" duct openings

14" x 3" Decorative Wood Air Vent HVAC Duct Cover Grille - Polished Finish Red Oak Wood - 2-Way Air Direction

Dimensions With Outer End are 11

+ Product Details Size - 12"w X 36"h is the size for the duct opening measurement only

20"W X 14"H [Duct Opening] ALUMINUM RETURN GRILLE Easy Air Flow Linear Bar Grilles [Outer Dimensions: 21.875"W X 15.875"H] Compatible with Duct 10" Actual Filter Size – 7 Compatible With Duct 7in Applications This sheet metal DDAG A 1212 Actual Filter Size – 7 3 4"w x 13 3 4" x 1" Ideal for Walls & Ceilings: Designed for seamless installation in standard 30" X 6" duct openings