Quote:

you said: when its on low it doesnt cut off for 5-6 hrs

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mechmono said:

yeah its controlled on a dimmer so it doesnt rage all the time.when its on low it doesnt cut off for 5-6 hrs


That is exactly the problem. You can't use a dimmer on an AC motor. You will burn it out. The speed of an AC motor is determined by the frequency of the current. In the U.S. it's 60hz. If your motor runs too fast, which I doubt, you'll have to get a motor speed controller. They make them for ceiling fans, and they're not much more expensive than a lighting dimmer. You'll need to get one of those, and you'll stop tripping the thermal overload.

I like a flow hood to blow fairly hard. A decent test is to light a bic lighter 12" from the face of the flow hood. It should blow the flame to the horizontal, but not blow it out. If it does this, you have the right flow. If it blows out the flame, either get a motor speed controller, or reduce the intake air. You can put a piece of foil or wood over part of the intake for the same result.