16"W X 6"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 17.25"W x 5.25"H] Rectangular Duct Caps Unlike other covers

Unlike other covers

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+ Product Details Size - 18"w X 14"h is the size for the duct opening measurement only

+ Product Details Size - 10"w X 36"h X 2"d (for duct opening measurement only)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 6" OR 6" x 30" duct opening (measured at the opening)

16"W X 6"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 17.25"W x 5.25"H] Rectangular Duct Caps Unlike other covers+ Product Details Size 16"W X 6"H is (for duct opening measurement only); actual front end outer dimensions are 17. 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