30" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w30h30 Built-In Locking System – Comes

Built-In Locking System – Comes with a permanently attached eight-tumbler lock and a supplied key for added security

Ideal for Walls & Ceilings: Designed for seamless installation in standard 14" X 8" duct openings

actual front end outer dimensions are approximately 20 5/8" width X 10 5/8" height

+ Product Details Size – 18" x 32" or 32" x 18" is the size for the duct opening measurement only

Actual Filter Size – 27 3/4"w x 29 3/4" x 1"

30" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w30h30 Built-In Locking System – Comes+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 12" OR 12" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 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