16" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum Width_20in + Product Details Size –

+ Product Details Size – 14" x 20" or 20" x 14" is the size for the duct opening measurement only

+ Product Details Size - 18"w X 34"h is the size for the duct opening measurement only

12"w X 4"h Is The Size For The Duct Opening Measurement Only

Design – Designed to withstand bends and sharp turns without kinking

which the interior PET provides

16" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum Width_20in + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 18. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 75" x 15. 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 Made from