How to Hook a Generator to Your Furnace Blower
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Shut off the breaker to your furnace.
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Cut the wiring and install the outlet to the wiring coming from the breaker panel. Get as close as you can to your furnace. If you are lucky, there will already be a switch there, and you will not need to buy the additional hardware. If you are really lucky, there will already be a plug there.
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Install the plug on the furnace side of the wiring.
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Plug the furnace in and reset the breaker. Check that the furnace runs properly.