12"W X 6"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 12.25"W x 7.25"H] snips + Product Details Size -

+ Product Details Size - 18"w X 8"h is the size for the duct opening measurement only

scratch-resistant

High Quality – Easy unrestricted airflow for your HVAC system - 7/8" margin turnback

+ Product Details Size - 30"w X 8"h X 2"d (for duct opening measurement only)

12"W X 6"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 12.25"W x 7.25"H] snips + Product Details Size -+ Product Details Size 12"W X 6"H is (for duct opening measurement only); actual front end outer dimensions are 13. 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