22" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w24h24 + Product Details Size –

+ Product Details Size – 26"w X 18"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 30 5/8" width X 24 5/8" height

+ Product Details Size - 32"w X 36"h is the size for the duct opening measurement only

only measure the "hole" in the wall/duct

+ Product Description Check out one of our most attractive and stylish grills

22" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w24h24 + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 22" x 36" OR 36" x 22" duct opening (measured at the opening), with actual outer dimensions of 24. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 21. 75" x 35. 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