14" x 16" or 16" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum - Cube Core + Product Details Size –

+ Product Details Size – 18"w X 24"h is the size for the duct opening measurement only

This thoughtful design ensures optimal air circulation for your HVAC system

75"H – fits a 8" X 4" duct opening

+ Product Details Size - 30"w X 2"h is the size for the duct opening measurement only

14" x 16" or 16" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Aluminum - Cube Core + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 14" x 16" OR 16" X 14" duct opening (measured at the opening), with actual outer dimensions of 16. 5" W x 18. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 13. 75" x 15. 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