For HVAC experts.I have never seen this before: a bathroom ceiling exhaust fan which is routed to the return air duct in the atticIs this a code violation? If not, is there any problem with ducting a bathroom exhaust fan into the return air duct to the furnace? Seems odd to me.
Miz T is spot on (as always)If the yarn frays easily you can always tie a little knot in the end of it.
NO NO NO NO, The Bathroom should be vented only to the outsideThis air is HOT and HumidShould Not be connected to the duct work at allQuick fix, take the fan loose from the duct and let it go into the attic, until better weather, and get a piece of insulation and tape up the holeWhen weather turns nice route the vent to the outsideKeeping the run as short as possible.
