30" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18" Diameter + Product Details Size –

+ Product Details Size – 6" x 10" or 10" x 6" is the size for the duct opening measurement only

+ Product Details Size – 30"w X 10"h is the size for the duct opening measurement only

+ Product Description Upgrade your ventilation with our premium grilles and registers

Upgrade your air distribution strategy today – invest in the efficiency and convenience of the 8" Radial Damper

from 4" to 20"

30" x 28" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 18" Diameter + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 28" OR 28" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 30. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 27. 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