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

Wall & Ceiling Applications

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

Rigid Built For External Use– The sturdy and rigid design features noise free components that eliminates vibration and excess noise to the louvers

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

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