When the exhaust fan overheats…

From LE…

Anyone have any ideas on this? I was only working for about 1.5 to 2 hours. And I didn’t even notice it had stopped until I went to shut it off. It’s an 800 cfm, and the motor is about 5-6 ft from the hood.

I shut the switch off, and tried it again after about 5 min or so and it started working after a couple of flips on and off of the switch. I felt the motor and it burnt my hand.

We have a woodstove in the garage, could have have made it too hot. My hubby says the ceiling area coudn’t have gotten hotter then 100 degrees. Definately cooler then the torch heat.

Might we need to move the motor outside the building due to the woodstove?

Instead of asking about the design of the exhaust system, one of the self-described “experts” proudly proclaims “bad fan”…

Interesting…but quite possibly wrong. While it certainly might be a bad fan, more likely it is improper exhaust system design.

The chief cause of overheating motors is high static pressure in the duct system. The “expert” didn’t bother to ask the questioner about the size of the ducting, how many bends, if the user had flex ducting. Nope. Just proclaimed “bad fan”. It’s amazing that this person has such insight and expertise that without asking any questions AT ALL, can simply diagnose the problem as being a bad fan.

When trying to discover the source of fan overheating, first focus on the exhaust system as a whole. Step back and review your design. Ask the following questions: What type of ducting was used? What diameter is the ducting? How many bends are in the system? What is the total length of the ducting? Are there any size changes in the ducting? Without knowing this critical information, no one can properly diagnose a ventilation system.

It’s very easy to blame the fan, but much harder to find the true cause of the problem.

Perhaps the “expert” should re-visit his response to find out more information before he makes a spot diagnosis.


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