Plastic circular vents cut into the soffit boards. These are usually retrofitted to properties.
Installed by removing 1 or 2 tiles/slates and sliding the vent in before securing it into place.
They run the full length of the soffit boards. These are typically installed at the time of construction.
The correct way to vent a bathroom fan through an attic is to terminate the vent either to the roof or soffit.
Finding condensation in the attic is surprisingly common. It is estimated that at least 1 in 5 homes are affected by this issue.
Attic condensation generally happens during winter & spring months when warm, moist air from the main living area rises into the attic space. When that warm, moist air meets the chilly underside of your roof’s deck, condensation occurs.
Moist air is created from everyday activities including cooking, showering, drying clothes etc, and moist air will dissipate throughout the house and up through the ceilings.
It also could occur due to blocked bedroom vents, lack of attic ventilation, unbalanced heating.
You should consider checking moisture levels in the rooms, upgrading the ventilation in your home, and using a thermostat to keep the constant room temperature and avoid big temperature changes during cold months.