28" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Adjustable Return Operating temperature from -40°f to

Operating temperature from -40°f to +248°f [-40°c to +120°c]

+ Product Details Size - 24"w X 34"h is the size for the duct opening measurement only

+ Product Details Size – 12" x 36" or 36" x 12" is the size for the duct opening measurement only

1/4” - 6518 PSI

75" width X 17

28" x 20" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Adjustable Return Operating temperature from -40°f to+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 20" OR 20" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 22. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 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