24" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter steel Actual Filter Size – 13

Actual Filter Size – 13 3/4"w x 15 3/4" x 1"

actual front end outer dimensions are 37

+ Product Details Perfect Fit & Easy Sizing - Designed for a 26" x 26" duct opening (measured at the opening)

+ Product Details Size - 12"w X 4"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 34 5/8" width X 16 5/8" height

24" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter steel Actual Filter Size – 13+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 14" OR 14" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 16. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 75" x 13. 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