30" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Grille + Product Details Size –

+ Product Details Size – 4"w X 10"h is the size for the duct opening measurement only

Aluminum Garage Door Air Vent Grille Register - With Damper Control Lever For Winter & Summer Settings - With Insect Net Prevent Guard [17

+ Product Details Size – 32" x 32" is the size for the duct opening measurement only

+ Product Details Size – 12" x 22" or 22" x 12" is the size for the duct opening measurement only

Actual Filter Size – 17 3/4"w x 31 3/4" x 1"

30" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Grille + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 10" OR 10" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 12. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 9. 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