Anon if i understand your original question you have a bath exhaust that is discharging into a roof cavity or space not to outside.
Bathroom or attic exhaust f.
In no case is it acceptable to just dump any exhaust fan directly into an attic.
Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons.
No you cannot vent your bathroom exhaust fan into the attic.
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Install an exhaust fan in the bathroom to exhaust steam to the outdoors.
There are wall mount exhaust fans as well as ceiling exhaust fans.
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Install the fan to vent outdoors not into an attic crawlspace or space between floors.
How do you do this.
Are exhaust fans required for a bathroom.
This is usually achieved by a quiet ceiling mounted bath fan or remote mounted inline or exterior mounted fans.
If the hole is too small then you ll need to increase the dimensions.
Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside.
Ceiling fans vent either into the attic or outside through the roof.
The fan exhaust must vent directly to the exterior of the home.
Installing a bathroom fan without attic access those individuals who are installing a bathroom exhaust fan without attic access will want to first measure the hole in the ceiling to make sure your new fan will fit in.
Another consideration to think about is the placement of your fan.
Bathrooms should be equipped with an exhaust fan that vents directly outdoors.
Bath fan exhaust can and does cause massive mold blooms and wood rot in attic spaces.
Not all building jurisdictions require bathrooms to have an exhaust fan if the bathroom has an openable window that has 1 5 square foot of open area when open.
Do not put the vent termination in a roof.
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On 2020 02 26 by mod bath exhaust vents need to be directed to the outdoors not just dumped anywhere inside the building.
If you have a bathroom with a separate enclosed toilet you ll also need an additional fan for that space.
Exhaust ventilation is probably the most common solution to meeting the continuous ventilation requirements.
Air is drawn from the house by the exhaust fan and outdoor air enters the house through leaks in the building envelope.