28" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w26h26 Actual Filter Size – 25

Actual Filter Size – 25 3/4"w x 21 3/4" x 1"

This versatile guard features air circulating ports on all four sides to allow proper airflow

actual front end outer dimensions are approximately 30 5/8" width X 14 5/8" height

actual front end outer dimensions are approximately 16

28" x 36" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w26h26 Actual Filter Size – 25+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 36" OR 36" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 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