installing a bathroom fan

parrolet said:

hello there need some advise my bathroom do not have a fan and in the past had have some mold re painted the bathroom but reliaze this will not last long now my question do not have a switch in my bathroom have a pull switch light now there is a venting hole in the ceiling that vents through the roof can i cut a bigger hole and vent the fan through that pipe and also there is a gri plug in the bathroom with a 15 w breaker from the box can i put a double box and have a gfi plug and a switch that can turn on and off the fan and how do i do that thank you tony

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Yes you can use that vent assuming that was being used as the previous way to vent the bathroom but you need to vent it directly to the exterior, you dont want moist air building up in the attic, and yes you could get away with changing that device to a two gang ring IF it was installed with a 4x4 junction box AND that circuit is dedicated to the bathroom, with the bathroom fan using less than 50% of the circuit ampere rating....HOWEVER, a bathroom fan and blow dryer may not last long on a 15 Amp Circuit, which is probably why 08 code requires 20 amp circuits in bathrooms...