16" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14in diameter + Product Details Size -

+ Product Details Size - 16"w X 4"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 10 5/8" width X 14 5/8" height

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 36" OR 36" x 30" duct opening (measured at the opening)

One model suits both T-Bar and Drywall installations

+ Product Details Size – 20"w X 36"h is the size for the duct opening measurement only

16" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14in diameter + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 10" OR 10" X 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 12. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 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