The Housing Association’s communal ventilation equipment needed servicing and maintenance to ensure it worked efficiently. The equipment is crucial for 24/7 operation, as all wet rooms are internal with no alternative ventilation. However, extract inlets had become blocked with dirt and debris, and fire dampers had closed due to age, despite the equipment being in correct working order. As a result, pre-airflow testing and cleaning results showed poor results, averaging from 0-5l/s.