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Spark arrestor units that provide protection against sparks and reduces dust load in connected filter system.
Safety alert from HSE: There has been a change in enforcement expectations for mild steel welding fume after new scientific evidence that exposure to mild steel welding fume can cause lung cancer and possibly kidney cancer in humans. As a result HSE has issued a safety alert, click here to read more.
Straight answers to the questions people ask most when choosing and fitting spark arrestors for fume extraction ducting.
It sits in the ducting between the source of the fume and the filter unit and catches hot sparks and larger particles before they reach the filter. It also removes some of the heavy dust, which reduces the load on the filter.Without one, sparks from grinding or cutting could be drawn along the duct and may ignite filter media or the dust held in it.
It depends on the process and the risk assessment. Arc welding produces spatter and some sparks, but most are caught near the source. Where welding is mixed with grinding, gouging or cutting, or where the duct is short and the filter is close to the work, sparks are more likely to reach the filter.If there is any doubt, fitting one is a sensible precaution. Ask our team to help you choose.
The arrestor must match the duct diameter and handle the airflow of the system. Duct sizes are normally quoted in millimetres or inches, so measure the duct you have and check the airflow range in the manual.An arrestor that is too small adds resistance and reduces extraction, and one that does not match the duct will not seal properly. Choose the size that matches your duct and the system airflow.
Fit it between the capture point and the filter unit, as close to the filter as makes sense but with a clear, straight run where possible. Follow the manufacturer's instructions for direction of airflow and orientation.The unit needs to be supported and accessible so you can empty and inspect it. Avoid fitting it in places where it is awkward to reach, because a hard-to-reach arrestor tends not to be emptied.
Yes. It collects heavy particles and sparks in a collection area, which needs emptying at intervals set by how much dust the process makes. If it fills, it stops working properly and can restrict airflow.Allow the contents to cool before emptying, handle them with gloves, and dispose of them as the manufacturer and local rules require. Keep a record of when it was checked.
Any component in a duct adds some resistance, and the effect depends on the design and how clean it is. A well-chosen arrestor of the right size has a modest effect, but a dirty or undersized one can cause a noticeable drop.When designing or changing a system, include the resistance of the arrestor in the airflow calculation, and have the extraction tested afterwards.