18" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 10in With HVAC Premium you get

With HVAC Premium you get an extra measure of quality that will be visible to your family members and house guests

+ Product Details Size - 14"w X 32"h is the size for the duct opening measurement only

Insulation density is 30kgs/cbm = 0

+ Product Details Size – 20"w X 12"h is the size for the duct opening measurement only

18" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible With Duct 10in With HVAC Premium you get+ Product Details Perfect Fit & Easy Sizing Designed for a 18" x 12" OR 12" X 18" duct opening (measured at the opening), with actual outer dimensions of 20. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 17. 75" x 11. 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