32" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14in diameter Round-neck-to-square-face construction results in 360

Round-neck-to-square-face construction results in 360 degree air diffusion pattern similar to a full round diffuser

actual front end outer dimensions are approximately 32

This grille has a high standard of design

actual front end outer dimensions are approximately 29

+ Product Details Size - 10"w X 12"h is the size for the duct opening measurement only

32" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14in diameter Round-neck-to-square-face construction results in 360+ Product Details Perfect Fit & Easy Sizing Designed for a 32" x 12" OR 12" x 32" duct opening (measured at the opening), with actual outer dimensions of 34. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 31. 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