1, the principle is different: ventilation is with the help of dilution ventilation exclusion other means to achieve indoor outdoor air quality assurance of a building environmental control technology; air supply system in the air supply at the same time into the indoor air into the filtration, sterilization, disinfection, sterilization, oxygenation, preheating (in winter); smoke exhaust system in the event of a fire can effectively control the spread of smoke; smoke quickly timely, to save lives, disaster relief work plays a key role in the The role of.

2, the composition is different: the ventilation system includes air inlet, outlet, air ducts, fans, cooling heating, filters, control systems other ancillary equipment, including a complete set of devices; sent to the sub-system including fresh air exchanger, piping, air other devices; smoke exhaust system is composed of induced draft fan, flue, gates chimneys, so on.

3, the role of different: ventilation system for urban rail transit (including subway), underground complexes, tunnels, civil defense projects, semiconductor industry, precision machinery, etc.; air supply system in the air supply at the same time to enter the indoor air into the filtration, sterilization, disinfection, sterilization, oxygenation, preheating (in the winter); the role of the exhaust system is the role of the building in the event of smoke fire, can be quickly started in a timely manner to the smoke discharged out of the building to create favorable conditions to save people save the fire. Save people fire to create favorable conditions.