Electric motor ignition is so rare that you may as well be worried about shark attacks in your swimming pool . I have a rear draft booth and don't think twice about explosions . Asphyxiation in my little shop is a bigger worry .
The show Myth Busters tried the myth that a shop vac picking up gasoline could become a jet engine . It turned out that they couldn't get the gas to even ignite without adding pure O2 and manipulating the motor .
If anyone gets enough fumes in their shop to blow the place up , the odds are that the poor SOB is already a gonner .
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