14" x 18" or 18" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w32h32 10"w X 3"h Is The

10"w X 3"h Is The Size For The Duct Opening Measurement Only

Design – These Supply Diffusers with integral round necks are recommended for heating

75"H – fits a 18" X 6" duct opening

Customize effortlessly with a removable face/door

+ Product Details Size - 30"w X 30"h X 2"d (for duct opening measurement only)

14" x 18" or 18" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w32h32 10"w X 3"h Is The+ Product Details Perfect Fit & Easy Sizing Designed for a 14" x 18" OR 18" X 14" duct opening (measured at the opening), with actual outer dimensions of 16. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 13. 75" x 17. 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