30" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 6in Design – Individually adjusting curved

Design – Individually adjusting curved blades for better air flow control

Actual Filter Size – 33 3/4"w x 11 3/4" x 1"

+ Product Details Size – 12"w X 18"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 18 5/8" width X 18 5/8" height

75" Width X 17

30" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 6in Design – Individually adjusting curved+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 34" OR 34" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 33. 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