24" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 8" Diameter /* Adding space between bullet

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+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 24" OR 24" x 18" duct opening (measured at the opening)

Design – Unrestricted airflow for your HVAC system - adjustable one-way louver with full horizontal airflow directional control - single deflection supply grill with 96% airflow - noise free components - no vibrating louvers etc

actual front end outer dimensions are approximately 37

24" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 8" Diameter /* Adding space between bullet+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 26. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 75" x 23. 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 Made from