12"W X 8"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 13.25"W x 9.25"H] 18in diameter just because they’re common doesn’t

just because they’re common doesn’t mean it’s any less annoying when it does happen

Every grille has a front end frame

Actual Filter Size – 13 3/4"w x 19 3/4" x 1"

Adjustable airflow control - by rotating the middle disk

12"W X 8"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 13.25"W x 9.25"H] 18in diameter just because they’re common doesn’t+ Product Details Size 12"W X 8"H is (for duct opening measurement only); actual front end outer dimensions are 13. 25" Width X 9. 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