10" x 34" or 34" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 36.5"] 2-Way this model allows for mounting

this model allows for mounting without removing the thermostat

+ Product Details Size – 6"w X 6"h is the size for the duct opening measurement only

+ Product Details Size - 12"w X 10"h is the size for the duct opening measurement only

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

Outer Dimensions Are 17

10" x 34" or 34" x 10" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 12.5" X 36.5"] 2-Way this model allows for mounting+ Product Details Perfect Fit & Easy Sizing Designed for a 10" x 34" or 34" x 10" duct opening (measured at the opening), with actual outer dimensions of 12. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 9. 75" x 33. 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