28"W X 6"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 29.25"W x 7.25"H] Compatible With Duct 12in + Product Details Size –

+ Product Details Size – 14" x 20" or 20" x 14" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 24 5/8" width X 20 5/8" height

featuring a 6" round duct opening

+ Product Details Size – 24" x 24" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 20 5/8" width X 14 5/8" height

28"W X 6"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 29.25"W x 7.25"H] Compatible With Duct 12in + Product Details Size –+ Product Details Size 28"W X 6"H is (for duct opening measurement only); actual front end outer dimensions are 29. 25" Width X 7. 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