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

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

Wall & Ceiling Applications

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

+ Product Details Size – 34"w X 20"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