We replaced the 2nd floor hallway bathroom exhaust fan with a new Panasonic quiet type select a speed fan and installed new 4 inch venting up to the gable vent. We will be returning on Friday to complete the basement exhaust fan (new install) We will be installing a new Panasonic fan in the basement bathroom with a new switch and venting to the back of the home. 9/24 Returned today and installed new Panasonic fan in the basement bathroom and vented out the back of the home. We removed the 2-gang switch box and installed a new 3-gang so that the fan could be controlled separately. We tested fan and it was running properly.