Newbi Fan Noise

Hey y'all. Got my new PB150 and after burn in I smoked some wings at 220. During burn in the fan ran at a constant speed. Smoking the wings, the fan rpm sounded like it was going up and down, not constant. Is this normal for low temp?

Thanks
Yes it is for all of them. Everyone of them need to settle in
Hopefully this helps you 🇺🇸🇺🇸
 
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