Any centrifugal fan that is secured to the fan motor shaft with only one bolt will eventually become loose and begin to hit the fan cage. This is especially so for fans that are heavy and operated horizontally. A fan that is hitting its cage will cause the temperature cut-out to trip and will eventually burn-out. These types of fans are usually found in furnaces. It may be possible to avoid this by drilling and tapping a second hole perpendicular to the first one on the fan for another bolt to better secure it to the motor shaft or check to make sure your fan is not secured by only one bolt before buying it.
- posted
13 years ago