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Plymovent Mobile Fume Extractors

Plymovent’s mobile filter units are designed to remove welding fumes on-site in confined spaces and spaces that are difficult to reach by fixed welding fume extraction systems, for example in the middle of a workshop or reversely, in an outer corner of a facility.

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.

Plymovent Mobile Fume Extractors FAQs

Straight answers to the questions people ask most when choosing and using mobile welding fume extractors.

What is a mobile fume extractor and when should I use one?icon-minus-redicon-plus-red

A mobile fume extractor is a self-contained wheeled unit with a fan and filter, normally used with a flexible extraction arm or a hose. It captures welding fume at the source, filters it and returns clean air to the workshop.

It suits site work, repair and maintenance, small batches, confined spaces and any place where a fixed system is not practical. It can be moved to wherever the welding is happening.

How is a mobile unit different from a stationary one?icon-minus-redicon-plus-red

A mobile unit is built to be moved, so it is more compact and generally handles one or two extraction points. A stationary unit is fixed in place and is better suited to continuous production, several arms or a central system.

If the welding is always in the same place and runs for long periods, a stationary unit may be the better choice. For varied locations, a mobile one is more flexible.

What types of filter do mobile units use?icon-minus-redicon-plus-red

Mobile units commonly use one of several filter designs: disposable cartridge or panel filters, filters that are cleaned automatically (often by pulses of compressed air), or electrostatic designs that collect particles on charged plates. Designs and cleaning methods vary between makers.

Your process, how many hours a day the unit runs and the material welded should guide the choice. Check the data plate and manual of any unit for its filter type, what it is suited to and how it is cleaned or replaced.

How do I choose between filter types?icon-minus-redicon-plus-red

Think about how many hours a day the unit runs, what you weld and what maintenance you can manage. Some designs need a compressed air supply for cleaning, some need collector parts washed at intervals and some need whole filters replaced.

For occasional welding a simpler filter is often enough, while heavy daily use may justify one that cleans itself to save time. Read the manual for any unit you are considering to see its maintenance needs and the replacement or cleaning intervals.

Do I need an extraction arm, and how does it affect performance?icon-minus-redicon-plus-red

Extraction only works if the capture point is close to the weld, so check what is included with any unit and whether an arm or hose and hood are needed. The hood should be as close to the arc as practical, positioned so the fume rises towards it.

A hood held too far away captures little. Longer arms, hoses and bends add resistance and reduce the airflow at the hood, so choose a length that fits the job. The manual for your unit will give the recommended hood position and arm length.

How do I know if a unit has enough airflow for my work?icon-minus-redicon-plus-red

Compare the unit's rated airflow with the demands of the process and the arm or hose fitted. Higher-current processes and flux-cored wires generate more fume than light TIG work. Airflow at the hood, not just at the fan, is what matters.

The manufacturer's guidance and the risk assessment should set the requirement. If you are unsure, ask our team or have an LEV specialist assess it.