Ventilation services businesses install, maintain and repair systems that move fresh air through homes, workplaces and other buildings. Work may include fitting extractor fans, whole-house ventilation, mechanical ventilation with heat recovery (MVHR), air handling units and ductwork. Systems are selected to suit the building, its use and the need to remove moisture, odours, heat or airborne contaminants while supplying replacement air. Typical services include assessing airflow requirements, designing or adapting duct routes, installing fans and controls, cleaning ducts, replacing filters and repairing faulty components. Engineers may test and balance airflow, investigate noise or poor extraction, and carry out scheduled maintenance to help systems operate as intended. Customers can expect advice on ventilation options for rooms such as kitchens and bathrooms, as well as larger systems for offices, shops, industrial premises and communal buildings.