Q: Should the pressurized blower and make-up fan be set up in a special machine room?
Answer: The pressurized blower and make-up fan in the building should be set up in the special machine room.
The pressurized machine room and the make-up fan room can be set up on the mezzanine of the stairwell, walkway and other locations, and the fire resistance limit of the machine room should not be less than 200h fireproof partition wall, 1The 50h floor slab and the Class A fire door should be separated from other parts by fire, and maintenance channels should be set up at the same time.
When it is difficult to arrange the pressurized blower independently, it can be shared with the make-up fan.
When the conditions are restricted, the pressurized blower and the make-up fan can be shared with the ventilation room, the air-conditioning room, and the new fan room, and the following conditions shall be met:
1) There should be an automatic sprinkler system in the computer room;
2) There shall be no exhaust fans and pipes for smoke exhaust and accident ventilation in the machine room;
3) The fire resistance limit of the computer room shall not be less than 200h fireproof partition wall, 1The 50h floor slab and the Grade A fire door are separated from other parts by fire protection.
Basis: GB51251-2017 "Technical Standard for Building Smoke Prevention and Exhaust System".
3.3.5. The mechanical pressurized air supply fan should adopt an axial fan or a medium and low pressure centrifugal fan, and its setting should comply with the following provisions: (paragraph 5).
5. The blower shall be set up in a special machine room, and the blower room shall comply with the provisions of the current national standard "Code for Fire Protection Design of Buildings" GB 50016.
4.5.3. The air supply system can adopt natural air intake methods such as evacuation external doors, manual or automatic openable external windows, and mechanical air supply methods. Fireproof doors and windows shall not be used as air supplementation facilities. The fan should be installed in a special machine room.