18" x 22" or 22" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 6in /* Adding space between bullet

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actual front end outer dimensions are approximately 32 5/8" width X 36 5/8" height

actual front end outer dimensions are approximately 30 5/8" width X 20 5/8" height

85" width X 15

fasten the edges to studs with the provided screws

18" x 22" or 22" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 6in /* Adding space between bullet+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 22" OR 22" x 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 24. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 21. 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