20"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 21.25"W x 5.25"H] Drop Ceilings / Aluminum only measure the "hole" in

only measure the "hole" in the wall

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

this non-pleated filter offers low resistance to airflow

Sealed & Concealed – Sealing strips between the inner & outer frame provide air-tight enclosure Easy Access – Provides easy access/removable door for HVAC

20"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 21.25"W x 5.25"H] Drop Ceilings / Aluminum only measure the "hole" in+ Product Details Size 20"W X 4"H is (for duct opening measurement only); actual front end outer dimensions are 21. 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