Final answer:
A "1" displayed on the heat and ventilation board at a terminal during the winter season means that the heating system is active but set to a low temperature. If the winter is exceptionally cold, a "1" may indicate that the heating system is not providing enough heat.
Step-by-step explanation:
In the context of the heat and ventilation board, a "1" displayed during the winter season indicates that the heating system is active and set to a low temperature. This means that the heat is on and working, but at a lower level compared to higher numbers on the board. For example, a "3" may represent a higher temperature setting.
The number on the board represents the level or intensity of the heat being provided. It is used as a reference for the occupants to know the current setting of the heating system and to adjust it if needed.
If the winter season is exceptionally cold, it is likely that the heating system will be set to a higher number, such as "3" or "4", to provide more warmth. So, a "1" during an exceptionally cold winter indicates that the heating system may not be providing enough heat to keep the space warm and may need adjustment or maintenance.