24" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w25h25 Actual Filter Size – 21

Actual Filter Size – 21 3/4"w x 27 3/4" x 1"

Actual Filter Size – 29 3/4"w x 33 3/4" x 1"

+ Product Details Size – 20" x 28" or 28" x 20" is the size for the duct opening measurement only

actual front end outer dimensions are 26

+ Product Details Size - 4"w X 16"h is the size for the duct opening measurement only

24" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w25h25 Actual Filter Size – 21+ Product Details Perfect Fit & Easy Sizing Designed for a 24" x 30" OR 30" x 24" duct opening (measured at the opening), with actual outer dimensions of 26. 5" W x 32. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 23. 75" x 29. 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