The term 'FORMER LAB HEATERS' can be summarized as 'ETNAS', which stands for Electric Thermal Non-Atmospheric System. This type of system is a type of heating system that is used in laboratories and other industrial settings. It is designed to provide a safe and efficient way to heat a space without the use of combustible fuels. The ETNAS system is typically powered by electricity and is capable of providing a consistent temperature throughout the space.