I found this bathroom style fan venting directly into the attic above the garage. No bathroom in the garage although there is a basin and a gas hot water tank. Anyone think this is an issue? Should I recommend venting to atmosphere? It is somewhat the same idea as a whole house fan? There was signs of mildew on the sheathing in the attic although that could be from other factors as the other attic (without the fan) had mildew as well.