18" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w6h6 Its elegant look and fine

Its elegant look and fine finish and the natural warmth of oak wood

Actual Filter Size – 29 3/4"w x 33 3/4" x 1"

actual front end outer dimensions are approximately 20 5/8" width X 22 5/8" height -

With its compact size and high-quality materials

unrestricted airflow with a precise 50° angled design

18" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w6h6 Its elegant look and fine+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 36" OR 36" x 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 35. 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