4"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 5.25"W x 5.25"H] Flat Elbow Transition˚ With its simple installation process

With its simple installation process and sturdy design

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 28" OR 28" X 16" duct opening (measured at the opening)

actual front end outer dimensions are approximately 30 5/8" width X 24 5/8" height

Actual Filter Size – 27 3/4"w x 27 3/4" x 1"

listed size +1

4"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 5.25"W x 5.25"H] Flat Elbow Transition˚ With its simple installation process+ 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