Installation of Exhaust Fans in Mobile Toilets

The installation of exhaust fans in mobile toilets requires comprehensive planning from four aspects: exhaust vent location, ventilation duct design, fan selection, and odor control. The specific points are as follows:

1. Selection of Exhaust Vent Location

The exhaust vent should be located away from areas where people are active to prevent direct diffusion of odors. The recommended installation positions are at the top of the toilet or high on the side wall, with a height of more than 1.8 meters above the ground to ensure it does not obstruct pedestrian traffic and avoids direct sunlight or rain. For split-type toilets, the exhaust vent should be placed within an independent ventilation module and connected to the exhaust ports of each compartment through ducts to prevent cross-contamination of odors.

2. Design of Ventilation Duct Layout

The duct layout should follow the principle of being "short, straight, and smooth" to reduce the number of bends and connections, thereby lowering air resistance. It is recommended that the duct diameter be no less than 10 centimeters. For split-type toilets, PVC ducts can be used to connect the exhaust ports of each compartment to the exhaust fan, ensuring efficient air circulation. Before installation, check the duct's airtightness to prevent air leakage that could reduce exhaust effectiveness.

3. Fan Selection and Installation Specifications

• Power Adaptation: For a single toilet compartment, it is recommended to use an axial or centrifugal fan with an air volume of 15-20 cubic meters per minute. For multiple compartments, increase the number or power of fans according to the area.
• Installation Requirements: The fan should be horizontally aligned and securely fixed to prevent vibration-induced noise. Maintenance space should be reserved around the fan body for easy upkeep.
• Protective Measures: Install rain louvers to prevent water ingress and insect screens to avoid blockage by insects, extending the equipment's service life.

4. Auxiliary Measures for Odor Control

• Dual Protection: In addition to the main exhaust system, activated carbon adsorption devices or deodorizing liquid sprays can be used to adsorb residual odors.
• Optimization of Airflow Patterns: The internal exhaust fan should adopt an "upper supply, lower exhaust" design, where air is supplied from the top and exhausted from the bottom, accelerating the removal of stale air.
• Routine Maintenance: Regularly clean the exhaust vent filters and duct walls to prevent dust buildup that could affect ventilation efficiency. Check the fan's operating status and replace aging components promptly.

Precautions: If renovating or replacing an exhaust fan, disconnect the power first, remove the old equipment, check the integrity of the wiring, then install the new fan and conduct a power-on test. Before installation, ensure there are no obstructions on the top to guarantee an unobstructed exhaust path.