26" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14" Diameter actual front end outer dimensions

actual front end outer dimensions are approximately 34 5/8" width X 26 5/8" height

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

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

The 1/2" white insulation

Experience hassle-free installation and full adjustability for optimal airflow

26" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14" Diameter actual front end outer dimensions+ 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