What Is a Centralised Filtration System?

A centralised filtration system connects multiple extraction points across a facility — arms, hoods, machine connections — to one or a few large filter units through a shared duct network, rather than a separate unit at every station.

Advantages

It offers economies of scale in filter area and maintenance (fewer, larger filter changes instead of many small ones), a single central point for dust/waste collection, lower per-station noise since the fan sits away from the hall, and under some conditions the possibility of heat recovery by returning filtered air to the hall in winter — subject to measurement and regulatory verification.

What to Watch For

Duct design gets more complex (airflow needs balancing across many branches, and there are more points where leaks and friction loss can occur), upfront installation cost is higher, and if the central system goes down, every connected station loses extraction at once — whereas with standalone units, a failure only affects one station. If not every station runs simultaneously, sizing should apply a realistic diversity factor for actual simultaneous demand rather than summing every station's nameplate capacity.

The Decision Point

Station count, their distance and layout, and growth plans are the main factors driving the choice between standalone units and a central system — this is the facility-scale version of the decision covered in "Flexibility Through Portable Fume Extraction."

Conclusion

A central system isn't always the more economical choice; the right decision depends on station count, layout, and how simultaneously the stations are actually used.

Frequently Asked Questions

Is a central system always more economical? — No, it depends on station count and distance. Can filtered air be returned to the space? — Under some conditions yes, verified by measurement and applicable regulation.

References

●        ISO 21904-1:2020 — scope and definitions.

●        General industrial ventilation design practice.