30" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Copper Coil + Product Details Size –

+ Product Details Size – 20"w X 12"h is the size for the duct opening measurement only

+ Product Details Size – 14" x 28" or 28" x 14" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 22 5/8" width X 12 5/8" height

Can be hooked up with our "Butterfly Dampers" for precise airflow control

+ 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

30" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Copper Coil + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 8" OR 8" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 7. 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