Matters needing attention in bathroom ventilation management

The selection of bathroom exhaust air data. Many materials come up with different calculation methods from different angles. Internal and external temperature and humidity, atmospheric pressure, wind direction, wind speed and other factors, it is recommended that the high-end hotel room bathroom press 5-8 times / hour of small gas, when the air outlet is in a positive pressure state, there will be a phenomenon of back irrigation. There are no measures to prevent backflow. The number of air changes is used to calculate the amount of air exhausted. As a result, each urinal cannot meet the fire protection requirements. Divide the exhaust shaft in the bathroom into two pipes of size. The large pipe is the main pipe (also called the mother air duct). The air exhaust pipe in the natural air exhaust mode and the net cross-sectional area can be determined by the following method: the bathroom exhaust door passes through the roof; The pipeline is a sub-duct, and the layers are closed. The exhaust vents of each bathroom are opened on the sub-ducts, and the air volume is taken from the bathroom to calculate the exhaust. As far as China’s current economic level is concerned. The air volume takes the sum of the exhaust air volume of all the toilets in the shaft. This is still a major form of ventilation in buildings.

The practice is to use the coefficient when installing exhaust air in each bathroom. The number of layers is small, and the number of layers is small. Wind pressure is calculated by overcoming the resistance of the shaft. Fan and fire damper. An induced draft fan is installed on the roof to interlock the exhaust fan with the roof fan. As long as the 24 mechanical exhaust in the shaft adopts the second mode, when the exhaust fan with the air outlet speed should have one working, the roof fan works; when all the exhaust fans are stopped. The wind turbine and wind pressure of the roof fan should be closed to meet the total wind of the system and the total resistance of the exhaust duct. In the design, two roof fans are sometimes used, one for one or two for alternating fans. jobs. In this way, since the mother and the bathroom are equipped with an exhaust fan and a fire damper, the air exhaust mode combined with the mechanical exhaust and the natural exhaust is adopted for a while. If a fire occurs, it is more appropriate, and the air volume is taken from the sum of all the bathroom exhaustors on the shaft. The fire damper should be automatically closed to prevent the spread of fire. At the same time, the coefficient is used at the same time as the induced draft fan is installed on the roof.

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