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actual front end outer dimensions are approximately 30 5/8" width X 24 5/8" height
+ Product Details Size – 26"w X 18"h is the size for the duct opening measurement only
+ Product Details Size - 32"w X 36"h is the size for the duct opening measurement only
+ Product Details Size - 4"w X 32"h is the size for the duct opening measurement only
75" Width X 11
22" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w24h24 actual front end outer dimensions+ 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