16"W X 6"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 17.25"W x 5.25"H] 6in diameter Actual Filter Size – 21

Actual Filter Size – 21 3/4"w x 17 3/4" x 1"

Easy Access – This panel offers convenient access to HVAC

+ Product Details Size & Compatibility – The 8" Galvanized Sheet Metal 90 Degree Oval Vertical Angle Elbow is compatible with Duct 8"

+ Product Details Size & Compatibility – The size of the wall angle register boot is 10" X 3

16"W X 6"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 17.25"W x 5.25"H] 6in diameter Actual Filter Size – 21+ Product Details Size 16"W X 6"H is (for duct opening measurement only); actual front end outer dimensions are 17. 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