28" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Black Filter Size - 21

Filter Size - 21

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 36" OR 36" X 14" duct opening (measured at the opening)

Actual Filter Size – 24 3/4"w x 19 3/4" x 1"

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

Polished Pre-Finish Gloss Varnish Ready To Install - Can Also Be Sanded And Re-finished According To Application Needs

28" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Black Filter Size - 21+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 26" OR 26" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 25. 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