28" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 8in Actual Filter Size – 24

Actual Filter Size – 24 3/4"w x 13 3/4" x 1"

Width vs Height

listed size +2" diameter

Installation of the vents will eliminate the need to raise the door ensuring security and constant air flow and reduced heat transfer into attics and adjacent house walls

Actual Filter Size – 31 3/4"w x 19 3/4" x 1"

28" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 8in Actual Filter Size – 24+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 10" OR 10" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 12. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 9. 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