6″ penetration for exhaust fan

Hello, I need to make a 6″ penetration in a gable wall from a conditioned unvented attic. I’m not experienced with doing penetrations the right way but strive to do a… Hello, I need to make a 6″ penetration in a gable wall from a conditioned unvented attic. I’m not experienced with doing penetrations the right way but strive to do a…Read MoreGreenBuildingAdvisor