Hot water heater makes loud fan blowing sound

Hot water heater makes loud fan blowing sound

by George
(Murrieta, Ca, USA)

I have a Rheem PowerVent 2, model #41VRP40N, natural gas water heater that started making loud noises like a loud fan blowing. It's coming from a black housing unit on top of the heater which I assume is the fan. Is this serious? Thank you.

Sincerely,

George R

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