24" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w10h10 actual front end outer dimensions

actual front end outer dimensions are approximately 36 5/8" width X 30 5/8" height

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Tamper-Proof Security – Features a robust design to prevent unauthorized access and protect your thermostat settings

Commercial Grade Aluminum - Will Never Rust - Designed for Warehouses

+ Product Details Size - 20"w X 12"h is the size for the duct opening measurement only

24" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w10h10 actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 36" OR 36" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 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