Do you have to have ductwork when installing a bathroom fan? The old one did not have ductwork venting to the outside, but it was supposed too. Our new vent (Broan Model 655) is supposed to as well but it is not possible to do... Will this cause a fire if we do not have the ductwork venting outside?

Stephanie

For the most part you are looking at moisture in the attic from the bathroom.