22" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Copper Coil + Product Details Size -

+ Product Details Size - 36"w X 12"h X 2"d (for duct opening measurement only)

With a 5" diameter for the duct opening measurement

actual front end outer dimensions are approximately 14 5/8" width X 22 5/8" height

+ Product Details Size – 36"w X 34"h is the size for the duct opening measurement only

22" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Copper Coil + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 22" x 18" OR 18" x 22" duct opening (measured at the opening), with actual outer dimensions of 24. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 21. 75" x 17. 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