10" x 16" or 16" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 18.5"] 10" Diameter + Product Details Size –

+ Product Details Size – 24"w X 36"h is the size for the duct opening measurement only

Install 2 Vents

Actual Filter Size – 17 3/4"w x 23 3/4" x 1"

+ Product Details Size – 24"w X 14"h is the size for the duct opening measurement only

this thermostat guard is compatible with most standard thermostat models

10" x 16" or 16" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 18.5"] 10" Diameter + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 10" x 16" or 16" x 10" duct opening (measured at the opening), with actual outer dimensions of 12. 5" W x 18. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 9. 75" x 15. 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