12" x 28" or 28" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter ceiling + Product Details Size –

+ Product Details Size – 12"w X 28"h is the size for the duct opening measurement only

Actual Filter Size – 33 3/4"w x 5 3/4" x 1"

10" x 8" Decorative Wood Air Vent HVAC Duct Cover Grille - Polished Finish Red Oak Wood - 2-Way Air Direction

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

Actual Filter Size – 15 3/4"w x 17 3/4" x 1"

12" x 28" or 28" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter ceiling + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 12" x 28" or 28" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 75" x 27. 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