28"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 29.25"W x 5.25"H] 3" Round Duct Pipe actual front end outer dimensions

actual front end outer dimensions are approximately 20 5/8" width X 32 5/8" height -

+ Product Details Size - 16"w X 32"h is the size for the duct opening measurement only

What does this mean

Actual Filter Size – 29 3/4"w x 19 3/4" x 1"

+ Product Details Size - 16"w X 12"h X 2"d (for duct opening measurement only)

28"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 29.25"W x 5.25"H] 3" Round Duct Pipe actual front end outer dimensions+ Product Details Size 28"W X 4"H is (for duct opening measurement only); actual front end outer dimensions are 29. 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