18" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Round Damper Ring + Product Details Size -

+ Product Details Size - 24"w X 36"h X 2"d (for duct opening measurement only)

Design – Designed to withstand bends and sharp turns without kinking

10" Circular Round Aluminum HVAC Supply Grille Air Diffuser - With Butterfly Damper - Vent Duct Cover

+ Product Details Size – 2"w X 12"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 8" x 12" or 12" x 8" duct opening (measured at the opening)

18" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Round Damper Ring + Product Details Size -+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 14" OR 14" X 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 16. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 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