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Mobile Fume Extractors
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Plymovent Extraction Fans
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Flexible extraction arm Ø160mm with exterior friction joints. Including round hood and mounting bracket. The arm is 360° rotatable. Hanging mounting.
Straight answers to the questions people ask most when choosing and using metal tube fume extraction arms.
Measure from the mounting point to the furthest place you will actually weld, and choose an arm that reaches it with the joints still slightly bent. An arm stretched fully straight is harder to position and tends to droop or pull out of place.Also think about the area the arm must cover: a long arm covers a wider circle but is heavier and harder to move precisely. If the work area is large, two arms or a different mounting point is often better than one very long arm.
As close as you can get it without being in the way. Capture drops off quickly with distance, so a hood close to the arc catches far more fume than the same hood held further back. Guidance on the best distance varies between makers and hood designs, so check the manual for your own arm.Position the hood to the side or just behind the arc, in the direction the fume rises, so the airflow carries fume away from your face rather than across it. Keep cross-draughts away from the work.
The arm's diameter and the airflow of the unit it is connected to must be matched. A fan that is too small gives weak capture at the hood, while a very large fan on a small arm makes noise and may blow the fume around rather than capturing it.The arm maker will state the airflow needed for effective capture at the hood. Remember that long duct runs, bends and extra arms on the same system all reduce the airflow that reaches each hood, so allow for them when selecting the fan.
Only if the arm is specifically designed and marked for that use. Some arms are made in special versions for areas where flammable gas, vapour or dust may be present, with materials and construction that avoid sparks and static build-up.A standard arm should not be used in such an area. Whether a space counts as a hazardous area is for your site risk assessment to decide, and the arm, the fan and the rest of the system must all be suitable. If in doubt, seek specialist advice before buying.