Is it really necessary to unplug a refrigerator and shut down a hot water tank before using an insect fogger?

The fogger is supposed to work for four hours before I go back into my 15 X 40 studio apartment. Will my food stay good that long? I remember using a fogger a year ago and I forgot to turn off either the refer or the hot water tank and everything was fine. Was I just lucky? The instructions on the can say to turn... show more The fogger is supposed to work for four hours before I go back into my 15 X 40 studio apartment. Will my food stay good that long?

I remember using a fogger a year ago and I forgot to turn off either the refer or the hot water tank and everything was fine. Was I just lucky? The instructions on the can say to turn off both.

I have electricity, not gas or propane.
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