18" x 22" or 22" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 8in diameter and installation is quick and

and installation is quick and simple with the included screws

you can attain the diameter of the vent

actual front end outer dimensions are approximately 32 5/8" width X 18 5/8" height -

actual front end outer dimensions are approximately 22 5/8" width X 18 5/8" height

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

18" x 22" or 22" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 8in diameter and installation is quick and+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 22" OR 22" x 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 24. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 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