18" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter White 75"H – fits a 14"

75"H – fits a 14" X 8" duct opening

is fireproof and ensures efficient thermal performance

but you will appreciate the benefits over the period of time

High Quality – high quality solid stamped steel with counter-sunk screw holes (screws included) and no sharp edges

18" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter White 75"H – fits a 14"+ 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