6" x 22" or 22" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 24.5"] w18h18 See chart below:

See chart below:

Actual Filter Size – 35 3/4"w x 27 3/4" x 1"

Rigid Built For External Use– The sturdy and rigid design features noise free components that eliminates vibration and excess noise to the louvers

Actual Filter Size – 24 3/4"w x 17 3/4" x 1"

and utility rooms

6" x 22" or 22" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" X 24.5"] w18h18 See chart below:+ Product Details Perfect Fit & Easy Sizing Designed for a 6" x 22" or 22" x 6" duct opening (measured at the opening), with actual outer dimensions of 8. 5" W x 24. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 5. 75" x 21. 75" x 1" Premium Airflow Efficiency High performance cube core eggcrate design allows 95% airflow efficiency, reducing energy costs and maximizing HVAC system lifespan. Durable, Rust Free Aluminum Made