How to distinguish whether workshop pollution comes from outside or inside?

To distinguish whether the gas pollution in the workshop comes from outside or inside, it is necessary to compare the period changes of the fresh air inlet, supply air, return air and work stations, and combine the material and ventilation records. A single point detection often does not fully describe the source. The logic of source judgment is to compare point by point along the air path, rather than just measuring a concentration at the work station.

1. Establish location and time comparison

Record production starts and stops, cleaning, wind direction and adjacent activities. Changes synchronized with an event can provide clues, but the context should be kept against other locations.

If the workplace concentration increases simultaneously when the outdoor emission source changes, but the workshop production status does not change, the source may be fresh air. If the concentration at the workstation only increases when a certain piece of equipment is running or a certain process is operated, and there is no obvious change in the fresh air inlet, the source may be internal. Aili Industry ischemical filters, confirm the processing direction according to the source location.When selecting Box-type chemical filter corresponds to fresh air treatment,FFU chemical filter corresponds to circulating air treatment. The relationship between levels and filtering requirements can be found inISO cleanliness level comparison。

2. Allow multiple sources to exist

The same gas may be input from both the outside and the inside. After determining the dominant source, arrange fresh air, circulation, local filtration and source control. It is not easy to choose one or the other.

There is often no single source of workplace air pollution. Outdoor background concentration and indoor release may exist at the same time, but in different proportions. After determining the dominant source, treatment measures should also be arranged separately: fresh air treatment is for external input, and source exhaust and circulation filtration are for internal release. Aili Industry isType V chemical filter andflat chemical filter packages according to processing position and air volume. Compare the structural forms of For the correspondence between multiple sources and filter positions, please refer toHEPA FAQs and Selection Guide。

3. Examples of project judgment

If there are still gas changes at the inlet when production is stopped, external input can be investigated; after production is resumed, compare whether there is additional load at the work station.

Comparison of out-of-production and running states can separate external inputs and internal releases. When production was stopped, the concentration at the workstation still varied with the outdoors, indicating the existence of external inputs; the concentration further increased after production was resumed, indicating that there were additional internal sources.

4. Application Check Points

5. Verification and subsequent use

Sampling and investigation need to correspond to actual usage conditions. Keeping records of the occurrence period, source events, ventilation and environment can help determine whether the data is representative. Unknown components should be listed as items to be confirmed and completed through appropriate testing, and limited information should not be expanded into all air conclusions.

Aili Industry ischemical filter scheme, filter sections are arranged according to source location,In the FFU chemical filter can be used with FFU to treat circulating air. The specific effect is subject to on-site testing.

6. Related questions and answers

Is the smell in the workshop due to external pollution?
uncertain. Internal cleaning, material and equipment releases may also cause odors, and changes in fresh air inlets and workstations need to be compared.

Can one test determine the source?
Usually not. Control data from multiple locations and time periods are required, and single-point detection makes it difficult to differentiate between external input and internal release.

What should I do if there is both external and internal pollution?
Treat them separately. The fresh air section is for external input, and the source exhaust and circulation filtration are for internal release. The verification of the two parts must be separated.

7. Related articles

Chemical filter product series

Box chemical filter

FFU 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 packages. It can compare FFU package, box type, flat type and V-shaped products according to gas composition, treatment air volume and installation conditions. 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.

learnChemical filter product series , check the products and air supply matching according to the project conditions. Clarify the goal → Check the conditions → Verify the effect → Arrange maintenance.