Explanation of common problems of HVAC professional drawing review

How to understand the “General Code for Fire Protection in Buildings” GB 55037-2022 Article 8.2.2, paragraph 4, mentioned in the “building area greater than 1000m2 underground or semi-underground Category D production sites should be taken to exhaust smoke and other smoke control measures”, where the “building area What is the meaning of “floor area” here?

A: The floor area here refers to the area of the same use space.

By the specification preparation group compiled by the General Code for Fire Protection of Buildings GB 55037-2022 implementation guide mentioned in article 8.2.2 referred to in the “production premises”, the floor area of the same space for the use of the same. For example, the floor area of 1200m2 of the underground Category D production space, the use of fire partition walls divided into two production space with an area of 600m2, because the area of a single production space does not exceed 1000m2, it can not do smoke exhaust facilities. It is worth noting that, if this area is a long-term stay for the production of personnel, because it is in the ground floor without opening the external window and the area of more than 50m2, then according to the “General Specification for Fire Protection of Buildings,” GB 55037-2022, Article 8.2.5, must be set up to mechanically exhaust smoke facilities.

Is there a requirement for the distance between the natural smoke vent window (opening) and the make-up air window (opening)?

A: In places where automatic smoke exhaust windows are installed, there is a distance requirement between the smoke exhaust windows (openings) and the supplementary air windows (openings).

Article 3.1.2 of the Code for Design, Construction and Acceptance of Natural Smoke Exhaust Systems (DB11/1025-2013) stipulates the places where automatic smoke exhaust windows are set up, and the text states, “Atriums and business halls, exhibition halls, auditoriums, theaters, stages, gymnasiums, passenger terminals, terminal buildings and other public large-space venues with a floor area of more than 500 m2 and a clear building height of more than 6 m shall be equipped with automatic smoke exhaust windows or fixed shutters as natural smoke exhaust windows. When natural smoke exhaust is used, automatic smoke exhaust windows or fixed shutters shall be installed as natural smoke exhaust opening components.” In order to ensure the effect of smoke exhaust in the above large space buildings, it is often required that the smoke exhaust window is set in a higher position, and it is difficult to open it manually in case of fire, so it is required to set up automatic smoke exhaust window for the above places. Article 3.2.8 of the Code for Design, Construction and Acceptance of Natural Smoke Exhaust System stipulates, “A make-up air system shall be set up in the place where automatic smoke exhaust windows are set up, and the make-up air system can adopt the natural ventilation methods such as evacuation doors, manually or automatically openable windows, etc., as well as mechanical ventilation methods. The setup of make-up air system shall comply with the following requirements:

3 The location of the make-up air outlet shall be located in the adjacent smoke-proof partition in the same space and far away from the smoke-exhaust opening, and the horizontal distance between them shall not be less than 5m; if the make-up air outlet and the smoke-exhaust opening are set up in the same smoke-proof partition, the make-up air outlet shall be located below the edge of the smoke-storage warehouse and the horizontal distance between it and the smoke-exhaust opening shall not be less than 1.5m.”

Except for the above places where automatic smoke exhaust windows (openings) are set up, for the rest of the places where natural smoke exhaust is set up, the distance between the make-up air outlet and the smoke exhaust opening is not clearly stipulated.