Most bath vents for homes are 3.
Exhasut fan vent through roof.
Each fan vents separately out the roof.
Next make sure you have one of the new roof exhaust vents on the roof and properly sealed.
I recommend replacing the vent pipe with insulated vent pipe.
Two bathrooms two roof vents each bathroom has its own exhaust fan.
Bathroom ventilation fan duct routing routing a bath vent duct down out or up through an attic or roof out.
The best way is to mark with nails in the middle of the rafter bay.
Both bathrooms are vented by a single in line fan that has one exhaust vent running through the roof.
Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot.
This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space.
The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood.
Next make sure it is securely fastened on both ends of the pipe.
In all cases the ducting needs to conduct the exchaust to the building exterior and needs to terminate in an animal proof vent cover.
Therefore i should take a more direct route to vent the fan right out through the roof.
You need to take a nail and you are going to drive it right through the roof sheathing through the roof shingles and it will stick up.