When accident exhaust can be avoided without supplemental air, the main reasons are as follows. Accident exhaust refers to a workshop that suddenly emits a large amount of harmful gases or explosive gases when the production equipment accidentally fails or has an accident. It is the ventilation used in emergency situations. The system is mainly for personnel to enter and repair in time to prevent explosions and other disasters from expanding; there is also post-accident ventilation, which refers to the gas fire extinguishing system installed in important electronic computer rooms to discharge toxic gases after the gas fire is extinguished. Rooms equipped with gas fire extinguishers generally do not need to install a smoke exhaust system.
The basement has ventilation and smoke exhaust. I saw that the 1# and 2# power distribution rooms have exhaust and air supply, generators, high-end equipment, and the fire pump room only has exhaust but no exhaust. Why?
General ventilation and process air supplementation of the diesel engine room are done by HVAC professionals. Others are determined by the electrical major. To put it simply: when the diesel engine room is not generating electricity, the air supply and exhaust are provided by HVAC professionals; and when the diesel engine room machines are working, the process air supply at this time is also provided by the HVAC department. Like process smoke exhaust, these are determined by the electrical major.
First of all, the code only requires that rooms in the basement (or enclosed) should be supplied with air. If it is a room with windows on the ground, it will not be supplied with air. Secondly, if they are all in the basement, the code also allows it. To carry out air supply in a fire protection zone, that is, to install a 70° fire supply air outlet on the partition wall of the high-end equipment, fire pump room, etc. (the air is usually exhausted in the machine room,) and it will close automatically when the inlet air temperature is 70° to prevent the spread of fire. .