Mobile Toilet Ventilation Pipe
The layout of the ventilation pipe for mobile toilets should be comprehensively designed from four aspects: the position of the exhaust outlet, the direction of the ventilation pipe, the selection and installation of the fan, and auxiliary measures for odor control. The specific points are as follows:
The position of the exhaust outlet should be prioritized in areas away from human activity to prevent odors from directly spreading into the usage space. It is generally recommended to install it on the top of the toilet or high on the side wall, at a height of more than 1.8 meters above the ground, to reduce direct impact on humans. At the same time, it should avoid areas exposed to direct sunlight and heavy rain to prevent equipment aging or rainwater backflow. If the toilet is located in a public area, the exhaust outlet should be kept at least 3 meters away from doors, windows, and other ventilation openings to prevent odor backflow due to airflow short-circuiting.
The direction of the ventilation pipe should follow the principle of being "short, straight, and smooth", minimizing the number of bends and connections to reduce wind resistance and air leakage risks. For split-type mobile toilets, the exhaust fans can be centrally installed in an independent ventilation module, with PVC pipes connecting the exhaust ports of each compartment. The pipe diameter should be selected according to the toilet scale: The national standard sizes for ventilation pipes are 10 cm, 16 cm, and 18 cm. For small restrooms (such as single-stall toilets), a 10 cm pipe can be used. If equipped with high-power devices like bathroom heaters, a 16 cm or 18 cm pipe is required. Note that a 75 cm pipe is a standard for drainage pipes and should not be used for ventilation systems. The connections between pipes should be secured with sealant or special clamps to prevent air leakage.
The selection and installation of the fan should be based on the number of toilet stalls, choosing an axial fan or centrifugal fan with appropriate power. For a single toilet stall, it is recommended to use a device with an air volume of 15-20 cubic meters per minute. For multiple stalls, the number or power of fans should be increased proportionally. During installation, maintenance space should be reserved (recommended to be no less than 0.5 meters). The fan body should be leveled and fixed with shock-absorbing pads to avoid noise caused by vibration. The fan outlet should be equipped with a rainproof louver (with an inclination angle of ≥45°) and an insect screen (with a pore size of ≤1 mm) to prevent rainwater backflow and insect entry.
Auxiliary measures for odor control can include activated carbon adsorption devices or deodorizing liquid spray systems to further purify the air through physical adsorption or chemical decomposition. When installing an exhaust fan inside the toilet, it is recommended to design an "upper supply, lower exhaust" airflow pattern: install supply vents at the top and exhaust vents at the bottom, utilizing the principle of hot air rising to accelerate the expulsion of stale air. During daily use, the filter screen of the exhaust outlet should be cleaned regularly (recommended once a month) to prevent dust blockage from affecting ventilation efficiency.
