28" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line Set actual front end outer dimensions

actual front end outer dimensions are approximately 36 5/8" width X 24 5/8" height

and Diffusers

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

actual front end outer dimensions are approximately 30 5/8" width X 36 5/8" height

28" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line Set actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 28" x 14" OR 14" x 28" duct opening (measured at the opening), with actual outer dimensions of 30. 5" W x 16. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 27. 75" x 13. 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