Mechanical Extract Ventilation (MEV) is a low energy whole house extract ventilation systems that continuously extract moist air from wet areas in the building at a low rates.
The MEV Unit is usually installed in an attic with ducts running from the MEV unit to all wet area (bathrooms, utility and kitchen) in the home extracting moist air & improving air quality.
Replacement air enters the home through window or wall vents.
Humidity sensor can be added to the MEV Unit so that the fan speed will increase when humidity levels rise.