I just found out that our bathroom exhaust fan has no duct attached to it. Our current fan is Panasonic FV-08VQ2 (90 CFM, 4" duct diameter). The fan just blows the air to the inaccessible attic. There is what looks like an attic exhaust close to the location of the fan but no duct (see white circle in the picture). The bathroom exhaust fan is about 5' from the window on the top floor. Here are my questions:
Is this a big problem? I assume the fan has been like this for 15+ years. If it is, I will look into getting a duct there, which is complicated by the inaccessible attic space.
Should we stop using the fan until this gets fixed?
Should we be concerned about any mold etc in the attic as a consequence of this?