18" x 22" or 22" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 6in /* Adding space between bullet

/* Adding space between bullet points */ }

+ Product Details Size - 12"w X 12"h X 2"d (for duct opening measurement only)

Universal Fit – Measures 6" wide x 3-1-13/16" high x 3-1/8" deep

+ Product Details Size – 30" x 34" or 34" x 30" is the size for the duct opening measurement only

18" x 22" or 22" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 6in /* Adding space between bullet+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 22" OR 22" x 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 24. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 21. 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