Is it okay to put magnets on the outside of my electric furnace?

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Flyover

Trying not to screw things up worse
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I believe we are looking at the return duct on the left side of this photo... I want to place a pair of fairly strong magnets approximately where the green circles are, to hold up a small whiteboard. The magnets would not be placed anywhere else on the furnace.

Is that okay or could it screw up something?

IMG_2022-11-10_11-41-02.jpeg
 
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