20"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 21.25"W x 5.25"H] Width_24in actual front end outer dimensions

actual front end outer dimensions are approximately 38 5/8" width X 32 5/8" height -

When first using this product

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 6" OR 6" x 36" duct opening (measured at the opening)

and conventional HVAC air conditioning system line sets

this cutter ensures smooth

20"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 21.25"W x 5.25"H] Width_24in actual front end outer dimensions+ Product Details Size 20"W X 4"H is (for duct opening measurement only); actual front end outer dimensions are 21. 25" Width X 5. 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