12" x 36" or 36" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter White Actual Filter Size – 13

Actual Filter Size – 13 3/4"w x 27 3/4" x 1"

complete with a supplied key

Easy Installation – Includes all necessary screws for quick and hassle-free setup

or office environments

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

12" x 36" or 36" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter White Actual Filter Size – 13+ Product Details Perfect Fit & Easy Sizing Designed for a 12" x 36" or 36" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 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