What Does This Button Do?

It’s time to guess what this red illuminated button does! Based on the icon, what do you think? 

My first guess is “turns a fan on and off,” but let me introduce the context to help.

This makes me less sure about the fan idea. What else could it be indicating? And, should I be worried that it was illuminated the entire time I was in the elevator without having been pushed by the occupant (it was only me in there)?

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