30" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w24h24 + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 28" OR 28" X 14" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 32" x 30" OR 30" x 32" duct opening (measured at the opening)

Its smooth

Marked circles for cutout

10" x 4" Decorative Wood Air Vent HVAC Duct Cover Grille - Polished Finish Red Oak Wood - 2-Way Air Direction

30" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w24h24 + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 6" OR 6" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 8. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 5. 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 Made