14" x 28" or 28" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 1-Way 75"H – fits a 18"

75"H – fits a 18" X 6" duct opening

actual front end outer dimensions are approximately 26 5/8" width X 30 5/8" height

it integrates effortlessly into T-bar or plaster frame ceilings

Actual Filter Size – 19 3/4"w x 21 3/4" x 1"

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

14" x 28" or 28" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 1-Way 75"H – fits a 18"+ Product Details Perfect Fit & Easy Sizing Designed for a 14" x 28" OR 28" X 14" duct opening (measured at the opening), with actual outer dimensions of 16. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 13. 75" x 27. 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