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When a rooftop A/C fan starts humming without spinning up, or won't start at all, a worn-out run capacitor is often the culprit. This replacement capacitor is rated at 14.16 MFD and 370V, matching common RV air conditioner fan motor requirements, with a snap-in mount for a straightforward swap.
A direct-fit way to get a stalling or humming rooftop A/C fan motor back to normal operation.