18" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w32h32 getElementById('hvac-product-accordion')

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+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 14" duct opening (measured at the opening)

Secure Locking Mechanism – Features a permanently attached eight-tumbler lock with a supplied key for added security

improves airflow

+ Product Details Size - 25"w X 20"h is the size for the duct opening measurement only

18" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w32h32 getElementById('hvac-product-accordion')+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 10" OR 10" X 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 9. 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