36" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 1-Way accordion-header h3 { margin: 0

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actual front end outer dimensions are approximately 10 5/8" width X 20 5/8" height

with actual outer dimensions of 16

Multi-shutter damper with easy lever for precise airflow control

+ Product Details Size – 16"w X 25"h is the size for the duct opening measurement only

36" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 1-Way accordion-header h3 { margin: 0+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 30" OR 30" x 36" duct opening (measured at the opening), with actual outer dimensions of 38. 5" W x 32. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 75" x 29. 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