12
Ventilation theory and air handling units
and heating coils, variable air volume (VAV) valves, thermostats and other air-handling equip-
ment are used.
Exhaust
air
Outside
air
Dampers
Air handling unit (AHU)
Supply
air fan
Return
air fan
Return air
Filter
Cooling
Heating
Solar
radiation
Wind
Thermostat
Thermostat
VAV valve
VAV valve
2.3 Mechanical ventilation systems
Main components of mechanical ventilation systems
The main components of a mechanical ventilation system are the following:
● Air handling unit (AHU)
● Air ducts
● Air distribution elements
Supply air
Outside air
Return air
Exhaust air
Types of mechanical ventilation systems
Mechanical ventilation systems can be subdivided based on the pressure relation between the
ventilated space and the ambient environment.