18" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14in diameter Actual Filter Size – 21

Actual Filter Size – 21 3/4"w x 15 3/4" x 1"

+ Product Details Size - 36"w X 14"h is the size for the duct opening measurement only

scratch-resistant surface that gleams like it's just been waxed

Easy Installation – Comes with all necessary installation screws for a quick and hassle-free setup

modern touch to your home

18" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14in diameter Actual Filter Size – 21+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 34" OR 34" x 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 33. 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