Product review (1 stars): Thermador Downdraft Ventilation: FIRE HAZARD
This product is a fire hazard.  After a few years, it's internal circuit board melted as did the wires leading to it and the fan was not functional except on high.  What appears to me as a manufacturing defect or design flaw, Thermador maintains is "normal wear and tear" and they refuse to fix or replace because it is out of warranty. It is a stupid design to begin with - speeds that are high enough to actually get rid of cooking odors pull too much flame away from the stove and are so loud you cannot have a conversation while cooking. However, if I plan to sell my home, a non-working ventilation fan for cooking in the middle of the kitchen is problematic for potential buyers.