4"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 5.25"W x 5.25"H] Aluminum Adjustable Curved Blade Actual Filter Size – 21

Actual Filter Size – 21 3/4"w x 29 3/4" x 1"

7/8" - 3397 PSI

Ideal for a range of activities including gardening

How To Measure A Floor RegisterOverall Size: Measure the size of the opening

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