14" x 16" or 16" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 10in diameter + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 36" or 36" x 12" duct opening (measured at the opening)

actual front end outer dimensions are approximately 20 5/8" width X 24 5/8" height

and its seamless drop-in installation process ensures effortless setup

+ Product Details Size - 34"w X 12"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 10in diameter + Product Details Perfect Fit+ 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