Looking to tackle the project of adding ventilation to my bathroom. My concern is where and how to run the duct. Some have said through the roof is the only way to go and others say out of the side of the attic. I'm not afraid to go through the roof however if I can avoid it that would be great. My concern is the length of the run from the fan housing to the side of the house is around 15 ft. Can anyone tell me if that is to long of a distance to run the duct? Also someone else mentioned taping in to the plumbing vent that exits the roof very close to where the fan would be placed. I don't think that would be wise because of sewer gases. Any help on this one is appreciated. Thanks!