20" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w18h18 Its linear bar design maximizes

Its linear bar design maximizes ventilation

The total outer size of this grille is the listed size plus 2 and 5/8"

360-Degree Airflow: Experience optimal air circulation like never before

+ Product Details Size – 25"w X 28"h is the size for the duct opening measurement only

modern Victorian

20" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w18h18 Its linear bar design maximizes+ Product Details Perfect Fit & Easy Sizing Designed for a 20" x 18" OR 18" x 20" duct opening (measured at the opening), with actual outer dimensions of 22. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 19. 75" x 17. 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