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Mike,
Gears need lubrication, and both gears and chains are noisy compared to belts. I will be conservative when I size the belt. Also, in my business we manufacture air pollution control systems that often have large fans. Most of these fans run 24/7/365 and the belts last for years. I think one of the reasons that automotive belts fail quicker is the severe environment that they operate in. All that heat from the ICE makes them fail quicker, IMO.
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