18" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter steel actual front end outer dimensions

actual front end outer dimensions are approximately 30 5/8" width X 24 5/8" height

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

Actual Filter Size – 27 3/4"w x 7 3/4" x 1"

actual front end outer dimensions are approximately 8

Sleek Design – The clear and unobtrusive design ensures it blends seamlessly with any home

18" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter steel actual front end outer dimensions+ 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