26" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14" Diameter + Product Details Size -

+ Product Details Size - 20"w X 10"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 16" OR 16" X 14" duct opening (measured at the opening)

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 – 11 3/4"w x 11 3/4" x 1"

The 1/2" white insulation

26" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14" Diameter + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 26" x 20" OR 20" x 26" duct opening (measured at the opening), with actual outer dimensions of 28. 5" W x 22. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 25. 75" x 19. 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