6" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" x 8.5"] w16h16 while the included installation screws

while the included installation screws make setup quick and hassle-free

75"H – fits a 14" X 12" duct opening

+ Product Details Size - 8"w X 36"h is the size for the duct opening measurement only

+ Product Details Size - 30"w X 18"h X 2"d (for duct opening measurement only)

+ Product Details Size – 20"w X 14"h is the size for the duct opening measurement only

6" x 6" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 8.5" x 8.5"] w16h16 while the included installation screws+ Product Details Perfect Fit & Easy Sizing Designed for a 6" x 6" duct opening (measured at the opening), with actual outer dimensions of 8. 5" W x 8. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 5. 75" x 5. 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 strong,