10" x 30" or 30" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 32.5"] Color_Anodized Aluminum 75"H – fits a 18"

75"H – fits a 18" X 18" duct opening

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+ Product Details Size – 36"w X 34"h is the size for the duct opening measurement only

Tamper-Proof Security – Features a robust design to prevent unauthorized access and protect your thermostat settings

controlled by a switch

10" x 30" or 30" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 32.5"] Color_Anodized Aluminum 75"H – fits a 18"+ Product Details Perfect Fit & Easy Sizing Designed for a 10" x 30" or 30" x 10" duct opening (measured at the opening), with actual outer dimensions of 12. 5" W x 32. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 9. 75" x 29. 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