Thomas R Forrest City , AR January 09, 2015 Appliance: Thermador Range Hood H-65 Thermador Range Hood H-65: Ventahood filter replacement. How to replace Grease Range Hood Microwave Filter 9-1/2" X 30" X 3/8". Simply removed the old filter and installed the new filter. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes