30" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6in diameter + Product Details Size –

+ Product Details Size – 26" x 34" or 34" x 26" is the size for the duct opening measurement only

ensuring your space stays dry and secure

+ Product Details Size – 28"w X 30"h is the size for the duct opening measurement only

+ Product Details Size - 6"w X 6"h X 2"d (for duct opening measurement only)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 34" x 28" Or 28" x 34" duct opening (measured at the opening)

30" x 18" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 6in diameter + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 18" OR 18" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 20. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 17. 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