To select and size a multi-station welding fume extraction system, start with the capture method at each workstation, then calculate the airflow required for the stations expected to operate at the same time. Next, account for duct layout, pressure losses, filtration requirements, and the collector’s operating range. Do not size a shared system by simply multiplying the number of stations by one assumed airflow unless every station is expected to run simultaneously. The right design depends on your welding processes, workpiece access, building layout, and maintenance requirements.
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This guide is for manufacturers planning a new installation, expanding an existing extraction network, or comparing centralized and workstation-level solutions. It explains the information to gather, the sizing decisions to make, and the questions to ask a supplier before requesting a quotation. The calculations below are illustrative planning examples, not a substitute for an engineered system design.
A multi-station welding fume extraction system collects airborne fume at several work areas and conveys it through ductwork to filtration equipment. Depending on the application, each station may use a hood, extraction arm, enclosure, or another capture arrangement. The system typically includes collection points, branch ducts, a main duct, a fan, and a filter unit, with controls or dampers used to manage airflow. Its purpose is to capture fume near its source rather than rely only on general room ventilation.
A centralized system connects multiple workstations to one collector and can be appropriate where stations are relatively fixed and a shared duct network is practical. A modular or decentralized arrangement places separate extraction units near individual work areas, which may suit layouts that change frequently or where long duct runs are difficult. Some facilities combine approaches, using centralized extraction for stable production cells and separate units for occasional or mobile work. Configuration should follow the plant layout and operating pattern, not a preference for one equipment type.
Before requesting a design, list the welding processes at each station, such as MIG/MAG, TIG, stick, or flux-cored welding, and note whether work is manual or automated. Record the material being welded, typical workpiece dimensions, station location, and whether operators need to reposition the capture device frequently. Also identify nearby doors, cranes, fans, or other airflow sources that could affect fume movement. These details help determine whether a hood, arm, enclosure, or alternative capture method is practical.
Local capture performance depends on bringing the intake close enough to the fume source and positioning it so it does not obstruct the work. An extraction arm can offer flexibility for varied manual work, while a hood or enclosure may be more suitable for a repeatable process or a defined work zone. Large workpieces and changing torch positions may make consistent capture more challenging. Ask the supplier to review how operators will use the capture points during normal production, not just how the equipment fits on a drawing.
Begin with the airflow requirement recommended for each proposed capture device and process by the system designer or equipment supplier. Add the requirements for stations expected to operate together, then check whether the operating scenario is realistic for the production schedule. As an illustration only, if a hypothetical design assigns 700 m³/h to each capture point and 10 stations may run at once, the combined requirement before system adjustments is 7,000 m³/h. These assumed values are for demonstrating arithmetic only and should not be treated as a general welding-fume design specification.
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If not all stations operate together, model a documented simultaneous-use scenario rather than applying an arbitrary diversity factor. For example, if the same hypothetical facility expects only 70% of its 10 stations to run at the same time, seven active points at 700 m³/h each would total 4,900 m³/h before duct and system design adjustments. Confirm the expected concurrency with production managers and consider peak periods, shift changes, and future expansion. A system that cannot maintain useful capture at the stations in use may not meet operational needs even if its nominal total airflow appears adequate.
The collector’s required airflow is not the only sizing consideration. Duct length, diameter, fittings, branch arrangement, filters, and capture-device resistance all contribute to the pressure the fan must overcome. A qualified designer should calculate the operating point for the complete system and check airflow distribution across branches, including what happens when some stations are closed. Request the design airflow and pressure information together, rather than comparing fans using airflow figures alone.
| Decision area | Information to provide or verify |
|---|---|
| Production | Processes, materials, operating hours, simultaneous-use patterns, and planned capacity changes |
| Capture points | Number and type of stations, workpiece access, hood or arm position, and operator requirements |
| Plant layout | Distances, duct routes, ceiling height, obstructions, fresh-air provisions, and installation constraints |
| Filtration | Filter configuration, cleaning method, dust collection and disposal arrangements, and maintenance access |
| Controls | Branch isolation, airflow adjustment, monitoring needs, and integration with existing equipment |
| Commercial scope | Equipment, ductwork, installation, commissioning, training, spares, and warranty terms |
Centralized systems may simplify management of a group of fixed stations, but they require careful duct planning and coordination with the building. Modular units can provide local flexibility, although multiple units may mean more separate equipment to maintain. A hybrid design can address different needs within one facility, but it should be assessed as a complete operating plan. Compare layouts, maintenance workload, energy implications, and the consequences of a unit or branch being unavailable.
Project cost depends on more than the collector: the number of capture points, ductwork, fan requirements, filtration configuration, controls, installation scope, and site conditions can all affect the quotation. For a meaningful comparison, ask suppliers to state what is included and identify any excluded engineering, electrical work, installation, or commissioning. Minimum order quantities and lead times vary by supplier, configuration, and production schedule, so request current written terms rather than relying on general estimates. If delivery timing matters, confirm drawing approval, customization, shipping, and installation milestones in the same discussion.
Request a proposal that documents the assumptions behind station airflow, simultaneous operation, duct routing, fan selection, and filtration. Ask how the supplier expects airflow to be balanced and how operators can identify a problem at a capture point. Confirm the scope of installation support, commissioning, operator guidance, spare parts, and after-sales service. A clear design basis makes it easier to compare proposals and identify differences in scope.
Send a facility layout, station count, process and material list, operating schedule, and photographs or drawings of the work areas where available. Include building constraints, preferred installation timing, electrical information if known, and any requirements for connection to existing equipment. Moland can review these project details to discuss a suitable multi-station extraction configuration, equipment scope, and quotation requirements. Final selection should be based on the confirmed application and a design review, not a generic airflow estimate.
A multi-station welding fume extraction system should be sized around effective source capture, realistic simultaneous use, and the resistance of the complete duct-and-filter network. First document each welding process and workstation, then establish operating scenarios and have the airflow and fan requirements reviewed as one system. Compare centralized, modular, and hybrid options based on your layout, flexibility needs, and maintenance capacity. To begin a supplier discussion, prepare a station layout and operating schedule and ask for a proposal that clearly states its assumptions, inclusions, and support scope.
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