Heathrow Airport This project at Heathrow Airport includes the review and modification of fire dampers and access within the terminal building to provide compliant access and coverage. New dampers will be installed with new BMS connections for status and monitoring. There are existing M&E services diversions required to meet access requirements and stakeholder engagement, to obtain access to various locations 49 different locations in this phase of work. Our involvement in this project consists of services diversions, new dampers and ductwork modifications. Heathrow Airport, Terminal 4 fire dampers phase 3 is a 36-week long programme which started on site in September 2019.