Can be shared, fans do have to be independent can be shared, but distinguish between high low speed.

Smoke exhaust system: a system that exhausts smoke to the outside of a building by means of mechanical smoke exhaust natural smoke exhaust.

Mechanical Smoke Exhaust System: A system that exhausts smoke to the outside of the building by means of a smoke exhaust fan.

Natural Smoke Exhaust: Using the buoyancy of the hot smoke gas generated during a fire the effect of external wind, the smoke is exhausted to the outside through the external openings of the building.

Smoke fire damper: Installed on the pipeline of the mechanical smoke exhaust system, it is normally closed meets the requirement of air leakage. It can be opened manually electrically when there is a fire the need of smoke exhaust, plays the role of smoke exhaust. When the smoke exhaust pipe temperature reaches 280 ℃ closed, in a certain period of time to meet the requirements of smoke leakage fire integrity, play a role in separating smoke fire valve.