18" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter steel + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 16" x 24" OR 24" X 16" duct opening (measured at the opening)

actual front end outer dimensions are approximately 10 5/8" width X 38 5/8" height

75" Width X 25

Design – Circular air supply valves - designed to be used in low and medium pressure ventilation air conditioning systems

18" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter steel + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 12" OR 12" X 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 11. 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