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How to Maintain Negative Pressure in the TrolMaster System

Understanding Positive Pressure in the System

Summary: This article explains why positive pressure can sometimes occur within the system and provides guidance on how to maintain negative pressure effectively.

Causes of Positive Pressure

Positive pressure in the TrolMaster system can occur under certain conditions, particularly when the settings of the intake and exhaust fans are not properly adjusted. Here are the primary reasons for this phenomenon:

  1. Incorrect Fan Speed Settings:

    • If the minimum speed of the intake fan (F2) is set too high, it can blow more air into the space than the exhaust fan (F1) can remove. This imbalance leads to positive pressure.
    • Conversely, if the exhaust fan (F1) is not powerful enough to adequately remove air from the space, it can also result in positive pressure.

  2. Fan Configuration:

    • The system is designed to maintain negative pressure by ensuring that the exhaust fan (F1) operates at a higher speed than the intake fan (F2). If this configuration is not followed, positive pressure may occur.

Maintaining Negative Pressure

To effectively maintain negative pressure in your system, consider the following steps:

  1. Adjust Fan Speeds:

    • Ensure that the exhaust fan (F1) runs faster than the intake fan (F2). This can be done by setting the intake fan speed lower than the exhaust fan speed.
    • A recommended practice is to set the intake fan speed 10-20% lower than that of the exhaust fan.

  2. Test the Pressure:

    • Use a simple test to check the pressure in the system. Hold a light tissue or a smoke source near a gap in the tent. If the tissue is drawn inward, negative pressure is maintained. If it blows outward, positive pressure is present, indicating that adjustments are needed.

  3. Consider Resistance Factors:

    • If using a carbon filter or a long ducting system, the resistance on the exhaust side may increase. In such cases, it may be necessary to increase the speed of the exhaust fan or decrease the speed of the intake fan to maintain negative pressure.

  4. Use Appropriate Equipment:

    • It is advisable to use a larger exhaust fan compared to the intake fan to ensure that more air is being removed from the space than is being introduced.

Conclusion

Positive pressure can occur in the TrolMaster system if the fan settings are not properly configured. By ensuring that the exhaust fan operates at a higher speed than the intake fan and regularly testing the pressure within the system, users can effectively maintain the desired negative pressure. Adjustments may be necessary based on specific equipment and environmental conditions to achieve optimal performance.