12"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 13.25"W x 5.25"H] 8" Round Duct Pipe + Product Details Size -

+ Product Details Size - 36"w X 32"h is the size for the duct opening measurement only

and air conditioning more efficient

+ Product Details Size - 34"w X 22"h is the size for the duct opening measurement only

75"H – fits a 20" X 4" duct opening

12"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 13.25"W x 5.25"H] 8" Round Duct Pipe + Product Details Size -+ Product Details Size 12"W X 4"H is (for duct opening measurement only); actual front end outer dimensions are 13. 25" Width X 5. 25" Height. Design Designed for concealed, flush placement on your wall with a 3 8 inch space between louvers, this linear grille comes with an installation frame and clips for easy hook in assembly, ensuring a refined and seamless look. High Quality Aluminum The premium durable aluminum will never rust and it will never