20"W X 6"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 21.25"W x 7.25"H] 14" Round Duct Pipe actual front end outer dimensions

actual front end outer dimensions are approximately 28 5/8" width X 14 5/8" height

Rigid design with noise free components - quiet airflow

Actual Filter Size – 13 3/4"w x 27 3/4" x 1"

+ Product Details Size – 18"w X 24"h pleated MERV 8 filter for HVAC return filter grille - 3 Pack

actual front end outer dimensions are approximately 35

20"W X 6"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 21.25"W x 7.25"H] 14" Round Duct Pipe actual front end outer dimensions+ Product Details Size 20"W X 6"H is (for duct opening measurement only); actual front end outer dimensions are 21. 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