Signs that your mechanical ventilation system may need repair include: Reduced airflow: The air coming from vents is weaker or less consistent. Unpleasant odors: Musty, stale, or burning smells could indicate mold or mechanical failure. Increased energy bills: If the system is working inefficiently, you might see higher electricity consumption. Strange noises: Whistling, banging, or grinding noises can be signs of a malfunctioning fan, motor, or duct. Excessive humidity: If the ventilation isn’t removing enough moisture, it could lead to condensation or mold growth. Noisy or malfunctioning fan: If the fan isn’t turning on or sounds unusually loud, it may need attention

A mechanical ventilation system is a mechanical method of regulating the air quality within an indoor environment. It works by introducing fresh air from the outside, exhausting stale air, and sometimes conditioning the air to control temperature and humidity levels. These systems are commonly found in: HVAC systems (Heating, Ventilation, and Air Conditioning) Exhaust fans Air handling units (AHUs) Heat recovery ventilators (HRVs) or Energy recovery ventilators (ERVs)