12"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 13.25"W x 5.25"H] Filter Grille + Product Details Size –

+ Product Details Size – 22"w X 12"h pleated MERV 8 filter for HVAC return filter grille - 3 Pack

Mounted with frame and bayonet joint which are included

+ Product Details Size - 12"w X 4"h is the size for the duct opening measurement only

providing maximum flexibility

12"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 13.25"W x 5.25"H] Filter Grille + Product Details Size –+ Product Details Size 12"W X 4"H is (for duct opening measurement only); actual front end outer dimensions are 13. 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