How to check the residual pressure outside the machine after MAU adds a chemical filtration section?

After the MAU adds a chemical filtration section, the new internal resistance should be included in the overall machine operation check to confirm that the required external residual pressure can still be provided under the target air volume. You cannot judge whether it is sufficient by just looking at the fan nameplate power or original rated air volume. The resistance of the newly added filter section will change the fan working point and affect the available residual pressure outside the machine.

1. Establish actual resistance accounts

Filters, supports and air path changes can all affect the operating point. The internal losses and external system requirements should be distinguished, and the air volume conditions corresponding to the data should be unified.

The external residual pressure of MAU refers to the pressure that the unit can provide to the external air duct. The internal resistance includes the filter, surface cooler, humidifier and internal losses of the box. Adding a new chemical filtration section will increase the internal resistance of the machine. If the fan capacity remains unchanged, the residual pressure outside the machine will decrease. When checking, the new resistance should be included in the total resistance inside the machine, and then confirm whether the residual pressure outside the machine still meets the needs of the external air duct. Aili Industry isthe box-type chemical filter, check it in sections according to the internal resistance of the MAU machine.When matching V-type chemical filter resistance data is provided based on target air volume. The relationship between levels and filtering requirements can be found inISO cleanliness level comparison。

2. Check the overall machine indicators after speed adjustment

Restoring the air volume may require adjusting the speed. The power, noise, control range and operating margin should be checked, and the working conditions of the chemical filter section should be confirmed.

If the fan speed can be adjusted, increasing the speed may restore the air volume and external residual pressure, but the power and noise will also increase. After adjustment, it should be confirmed whether the fan is within the allowable operating range and whether the air volume of the chemical filter section is within the design range. Aili Industry isIn the FFU chemical filter package, check the filter section conditions according to the operating status after speed adjustment.The EC DC speed regulation of the FFU fan filter unit can be adjusted in conjunction with the system. The relationship between fan speed regulation and system resistance can be referred toHEPA FAQs and Selection Guide。

3. Examples of project judgment

When the end air supply is insufficient after adding a new filter section, the overall machine curve and on-site resistance can be combined to check, instead of just increasing the speed alone.

Insufficient air supply at the end may be caused by insufficient residual pressure outside the machine or changes in air duct resistance. The overall machine performance curve and on-site measured resistance should be combined to determine whether the problem lies in the fan, filter section or air duct.

4. Application Check Points

5. Verification and subsequent use

After the filter section is added or adjusted, the actual air supply and target gas should be checked separately. Recording fan settings, air volume, and temperature and humidity can help explain subsequent changes. Gas effects, particle requirements and room airflow each have corresponding methods, and passing one of them cannot replace the acceptance of all.

Aili Industry isIn the chemical filter MAU modification plan, the external residual pressure is checked according to the new resistance and fan capacity. The specific operating parameters are subject to on-site debugging and test results.

6. Related questions and answers

Will the residual pressure outside the machine decrease after adding a chemical filtration section?
Usually yes. The new resistance consumes the available pressure of the fan. If the fan capacity remains unchanged, the residual pressure outside the machine will decrease.

Can it be restored by increasing the fan speed?
It may be restored, but it is limited by the allowable range and power of the fan. The noise and operating status need to be checked after adjustment.

Will insufficient residual pressure outside the machine affect the terminal air supply?
meeting. The residual pressure outside the machine is the ability to overcome the resistance of the external air duct. When it is insufficient, the terminal air volume may not reach the design value.

7. Related articles

Chemical filter product series

Box chemical filter

V type chemical filter

HEPA FAQs and Selection Guide

8. Key points for selection and acceptance inspection

9. Aili Industrial products and equipment supporting equipment

Aili Industry provides chemical filters and clean air supply equipment selection and matching, and can check the air-conditioning box matching based on fresh air gas, filter section location, fan residual pressure and maintenance channels. The manufacturing and supporting system covers the independent research and development and production of motors and fans, control systems, sheet metal, air filters and complete machine assembly, making it easy to jointly confirm the filter section, power and structural conditions. The specific gas effect, environmental suitability and service life still need to be verified based on the corresponding configuration data and actual working conditions.

learnMAU box-type chemical filter , check the product and air supply matching according to the project conditions. Clarify the goal → Check the conditions → Verify the effect → Arrange maintenance.