22" x 26" or 26" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w18h18 actual front end outer dimensions

actual front end outer dimensions are approximately 10 5/8" width X 12 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 20" or 20" x 8" duct opening (measured at the opening)

actual front end outer dimensions are approximately 18 5/8" width X 26 5/8" height -

+ Product Details Size – 18"w X 36"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 26" duct opening (measured at the opening)

22" x 26" or 26" x 22" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w18h18 actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 22" x 26" OR 26" x 22" duct opening (measured at the opening), with actual outer dimensions of 24. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 21. 75" x 25. 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