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 Actual Filter Size – 17

Actual Filter Size – 17 3/4"w x 15 3/4" x 1"

with actual front end outer dimensions of 7"

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

this fitting is perfectly compatible with 4-inch ducts

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 34" or 34" x 12" duct opening (measured at the opening)

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 Actual Filter Size – 17+ 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