12" x 36" or 36" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w18h18 + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 22" or 22" x 6" duct opening (measured at the opening)

14" x 3" Decorative Wood Air Vent HVAC Duct Cover Grille - Polished Finish Red Oak Wood - 2-Way Air Direction

Marked circles for cutout

+ Product Details Size – 32"w X 34"h is the size for the duct opening measurement only

+ Product Details Size – 24"w X 22"h is the size for the duct opening measurement only

12" x 36" or 36" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w18h18 + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 12" x 36" or 36" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 38. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 75" x 35. 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