18" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w34h34 + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 14" OR 14" x 20" duct opening (measured at the opening)

expanding or retracting the gap to meet your precise needs

2" X 10" Brass Victorian Floor Register Grille - Modern Contempo Decorative Grate - HVAC Vent Duct Cover - Brass Plated

+ Product Details Size – 20" x 30" or 30" x 20" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 36 5/8" width X 10 5/8" height

18" x 8" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w34h34 + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 8" OR 8" X 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 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