36" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 8in diameter Perforated steel grille for return

Perforated steel grille for return air flow

& EN 13180 standards

See our separate listing of T-Bar Supply Grilles

+ Product Details Universal Fit - Accommodates almost any thermostat with dimensions of 8-1/4" H x 5-3/8" W x 3-1/2" D

+ Product Details Size - 25"w X 20"h is the size for the duct opening measurement only

36" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 8in diameter Perforated steel grille for return+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 18" OR 18" x 36" duct opening (measured at the opening), with actual outer dimensions of 38. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 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