buying guide
The Complete Guide to Choosing a Welding Fume Extraction System
How to choose the right welding fume extraction system for your workshop: types, components, and what actually determines cost.
Choosing a welding fume extraction system comes down to matching the equipment to your space, your process, and how often you weld. Get it right, and you protect your team, stay compliant, and avoid paying for capacity you don't need. This guide walks through the main system types, the components and features that actually matter, realistic costs, and the leading brands. So you can make a confident decision whether you're kitting out a single bay or a full production floor.
What Types of Fume Extraction System Are There?
Welding fume extraction systems fall into four main categories, and most workshops end up using a combination rather than a single solution.
- On-torch/at-source extraction. Captures fume right at the point it's created, using a fume extraction torch or a nearby extraction arm. This is the most effective method for reducing exposure, since it stops fumes before they enter the welder's breathing zone, and it's well-suited to confined spaces or where a fixed hood isn't practical.
- Mobile filtration units. Portable, self-contained extractors on castors, ideal for workshops where welding happens in different locations or where a fixed installation isn't justified. They suit light to medium duty work and give you flexibility as jobs change.
- Fixed/wall-mounted systems. Use a suction arm connected to a stationary filter unit and are the standard choice for a permanent welding bay. They handle higher volumes than mobile units, and many offer automatic filter cleaning for continuous use.
- Centralised/ducted systems. Extract from multiple welding stations into one large, powerful filtration unit; the right choice for busy industrial workshops with several welders working simultaneously, where individual mobile units would be impractical to manage.
What Should I Consider When Choosing a System?
These key factors should drive the decision:
What Are the Key Components of a Fume Extraction System?
- Capturing element: the point where fume is actually captured: an extraction hood for bench or fixed-position work, an on-torch attachment that captures at the source, or a nozzle/inlet on a mobile unit
- Arms and hoses: connect the capturing element to the filter unit and position it close enough to the weld to work effectively; available in various reach lengths, and the main thing that determines how flexible a system is in practice
- Filter unit: the core of the system: cartridge filters for general-purpose use, HEPA for the finest particulate, carbon for odour control, and W3-rated filters where required for higher-hazard fumes such as stainless steel
- The unit itself: the housing, fan, and motor that draw air through the system; ranges from a small mobile cart to a large wall-mounted or centralised installation, and this is what determines airflow capacity and whether filters are self-cleaning or disposable
- Ductwork: required for fixed and centralised systems to route captured fume from multiple arms or hoods back to a shared filter unit; mobile and on-torch systems generally don't need this, since the filter is built into the unit itself
Every one of the components above, assembled into a working system, counts as local exhaust ventilation (LEV) under HSE terminology, and needs to be assessed and maintained as part of your LEV compliance obligations. See our Fume Extraction Guide for the full compliance picture.
What's the Typical Cost Range?
Cost varies significantly by system type and capacity:
- PAPR (powered air-purifying respirator) units, worn with a welding mask, start from around £350. A sensible addition for site work or as a backup layer alongside a fixed system.
- Mobile filtration units with a hood and self-cleaning filter typically start around £4,000 new.
- Large-volume fixed/centralised systems for heavy-duty industrial use run from around £15 - 20,000, depending on capacity and features
Buying used or refurbished equipment can offer significant savings against these new prices while still delivering full manufacturer-standard performance when properly serviced and tested. See our New vs Used Welding Equipment guide for the general trade-offs.
Which Fume Extraction Brands Should I Consider?
The leading dedicated extraction manufacturers are Nederman, Kemper, Extractability, and Plymovent. All of whom design extraction-specific solutions across mobile, fixed, and centralised categories, with options for niche applications. Some welding equipment manufacturers, including Lincoln Electric, ESAB, and Miller, also produce their own fume extractors, worth considering if you're standardising on a single equipment brand across your workshop.
Do I Need a Different System for Plasma Cutting?
Plasma cutting produces its own fume and particulate profile and is subject to the same COSHH and LEV requirements as welding; see our Fume Extraction Guide for the specifics on plasma fume control.
Do You Offer LEV/COSHH Testing?
Yes, once your system is installed, it needs thorough examination and testing at least every 14 months under COSHH Regulation 9 to stay compliant and inspection-ready. Westermans can arrange a comprehensive LEV service visit for various types of extraction equipment, with half-day and full-day site visits available depending on the number of units and site location. Find out more about our annual LEV/COSHH testing.
FAQs
What's the difference between a mobile and a fixed fume extraction system?
A mobile unit is a portable, self-contained extractor that can move between jobs or bays, ideal for light-to-medium duty and flexible workshops. A fixed system uses a suction arm connected to a stationary filter, built for permanent welding stations and higher-volume use.
Do I need a HEPA filter for welding fume extraction?
HEPA filters capture the finest particulate and suit applications with especially fine fume, but most welding fume extractors use W3-rated cartridge filters. These are specifically rated for higher-hazard welding fumes such as stainless steel; check your material and process before assuming HEPA is required.
How do I know what size fume extraction system I need?
Match the system to your space, duty cycle, and welding volume: occasional light welding in a small bay suits a mobile unit, but continuous production welding across multiple stations will need a centralised system with sufficient airflow capacity for every extraction point running at once.
Can I use one fume extractor for multiple welders?
Yes, with a centralised or ducted system designed for multiple extraction points, but it needs to be sized for the combined airflow demand of all stations running simultaneously, not just a single welder.
Is a new or used fume extraction system better value?
Used and refurbished systems from reputable suppliers can offer significant savings over new while still meeting full performance and compliance standards. Provided they're properly serviced, tested, and supplied with a warranty.
Does a fume extractor need regular maintenance?
Yes, filters need scheduled replacement, and the system as a whole must be thoroughly examined and tested at least every 14 months under COSHH Regulation 9 to stay compliant. Westermans offers on-site LEV/COSHH testing for any form of extraction equipment, in addition to the compliance detail covered in our Fume Extraction Guide.
