20"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 21.25"W x 5.25"H] Round Duct Pipe 25" Width X 9

25" Width X 9

Actual Filter Size – 7 3/4"w x 31 3/4" x 1"

The corner cap is used to create a seal between your wall and line set

Design – Circular return valves - designed to be used in low and medium pressure ventilation air conditioning systems

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20"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 21.25"W x 5.25"H] Round Duct Pipe 25" Width X 9+ 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