How to choose a workplace fume extraction system
A workplace fume extraction system captures smoke, dust and vapours right at the source before they reach the air you breathe. This guide shows how to match capture method, airflow and filter stage to hazardous substance and TRGS requirements.
View extraction unitsWhich capture method fits my process?
The capture method decides how close the extraction sits to the contaminant source. The closer the capture, the lower the airflow you need and the more reliable the result. As a rule, capture at the source always beats general room ventilation.
For point processes such as soldering, a flexible extraction arm or a small bench unit with a nozzle right at the iron works best. For changing positions, an articulated hood is fixed above the source. For area emissions such as bonding or cleaning stations, a bench or wall hood is the better choice.
How much airflow does the system need?
The airflow in m³/h must be high enough to create a sufficient capture velocity at the extraction point. For welding and solder fume, roughly 0.3 to 0.5 m/s at the capture opening is a useful guide value depending on the source.
- Solder fume at a single station: around 100 to 150 m³/h per extraction arm.
- Welding fume with a hood: about 150 to 250 m³/h per capture point.
- Several arms on one unit: add the airflows and plan a reserve.
- Long or branched ductwork raises pressure loss and the fan power required.
Which filter stages are required?
The filter stage depends on the hazardous substance. Recirculating units that return the cleaned air to the room must reliably stay within the limit values. For solder and welding fume, TRGS 528 sets the framework, backed by the Hazardous Substances Ordinance.
- Check filters regularly and document their service life.
- Use a loading indicator or differential pressure switch to spot changes in time.
- Base the choice on a risk assessment under the Hazardous Substances Ordinance.
Frequently asked questions
What capture velocity do I need?
At the capture opening, roughly 0.3 to 0.5 m/s is a guide value for solder and welding fume. What matters is that the airflow reliably catches the fume before it rises into the breathing zone.
Is a recirculating unit enough or must I exhaust outside?
Recirculating units are allowed if the filter stages reliably meet the limit values. For certain carcinogenic or sensitising substances the TRGS and Hazardous Substances Ordinance rules apply, and in doubt the air is exhausted outdoors.
Why do I need an activated carbon stage for soldering?
Besides particles, solder fume contains gaseous flux components such as rosin. HEPA filters do not bind these, so an activated carbon stage handles them.
How often must filters be changed?
That depends on the process and the load. A loading indicator or differential pressure switch shows the right moment, and service lives should be documented.
Looking for the right fume extraction?
We supply extraction arms, bench and hood units with HEPA and activated carbon filters - sized to TRGS 528 and the Hazardous Substances Ordinance.
Rule compliant
Sized to TRGS 528 and the Hazardous Substances Ordinance.
Capture at the source
Extraction arms and nozzles catch fume right where it forms.
Multi-stage filters
Pre-filter, HEPA and activated carbon for particles and gases.
Expert advice
Our specialists help with airflow and filter selection.