To size a CNC plasma table fume extraction system, start with the table’s usable cutting area, extraction layout, cutting materials and operating pattern—not just the plasma cutter’s rated power. Then establish the airflow required at the table, account for duct and filter resistance, and select a collector and fan that can deliver that airflow at the system’s operating static pressure. The correct final specification depends on the table design and should be confirmed with the table or extraction-system supplier. A fan’s maximum airflow rating alone is not enough to establish suitability.
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Begin with the table’s outside dimensions and its usable cutting area. Record the number of extraction zones, how each zone opens or closes, and whether extraction is provided through the table, an enclosure, or another capture arrangement. Also document the materials cut, typical and maximum thicknesses, torch count, cutting speed range and expected operating schedule.
These details matter because table footprint does not equal the area being extracted at every moment. A zoned table may concentrate airflow near the active cutting area, while a full-length open plenum may require a different design. If the table is enclosed or uses a manufacturer-designed down-draft arrangement, use that design’s airflow requirements rather than applying a general hood calculation.
Ask the table manufacturer or extraction-system designer for the required airflow for the specific table and cutting configuration. Where airflow is not provided, the designer may need to determine it from the capture arrangement, opening dimensions, zone strategy and expected fume generation. Do not assume that one airflow value per square metre will suit every plasma table.
For a simple illustration of area calculation, a table with a usable cutting area of 1.5 m × 3 m has an area of 4.5 m². That figure describes the work area only; it does not establish the airflow requirement. The design airflow must come from the table’s extraction method and the conditions under which it will operate.
For a zoned system, identify which zones can be open at the same time and which are expected to operate during cutting. The fan and controls must be selected for the intended combination of active zones, with enough airflow reaching those zones to support capture. If operators may open several zones at once, size and control the system for that actual operating condition rather than an idealized single-zone scenario.
For example, if a supplier’s design specifies 2,000 m³/h for each of four zones when all are open, the combined design airflow would be 8,000 m³/h. These are illustrative figures for showing the addition, not a recommended rate for a particular table. Confirm the airflow per zone and the permitted operating combinations with the equipment designer.
Once the airflow target is known, map the duct route from the table to the collector. Record duct length, diameter, bends, branches, transitions, dampers and any other components that create resistance. The fan must deliver the required airflow against the resistance of the complete system, including the filters in their expected operating condition.
Ask for fan performance at the design static pressure, not only a maximum airflow figure that may apply with little or no resistance. Undersized ducts, unnecessary bends or poorly balanced branches can reduce airflow at the table. A longer route or a future duct extension may also change the required fan selection, so include likely expansion plans before finalizing the design.
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Choose a collector intended for the fume and particulate produced by the materials and cutting process. Discuss the expected dust characteristics, spark potential, filter type, filter-cleaning method, dust discharge arrangement and maintenance requirements with the supplier. The appropriate configuration can depend on the material, operating conditions and applicable site safety requirements.
Filter area and cleaning design should be selected for the specified airflow and dust loading, using the collector manufacturer’s engineering guidance. Do not assume that adding a larger fan will compensate for an unsuitable filter or collector. A complete selection should state the design airflow, operating static pressure, filtration arrangement and the conditions under which the quoted performance applies.
A zoned down-draft table, a fully open table and an enclosed cutting area do not necessarily need the same airflow. The size and position of openings, the way zones are controlled and the degree of enclosure influence how air is drawn through the cutting area. Use the table’s own extraction data where available, and ask for design confirmation if the table and collector are supplied separately.
Different materials and cutting conditions can affect the fume and dust load presented to the system. Provide the supplier with a realistic material list, thickness range and cutting schedule, including whether the machine runs continuously or intermittently. If production changes later, such as adding another torch or cutting thicker material more often, reassess the system rather than assuming the original selection still fits.
The collector’s location affects duct length, bends and system resistance. It can also influence where clean air is discharged and how maintenance access is arranged. Plan the full route before ordering the fan and collector, and have the design checked if the installation includes a long run, multiple branches or significant elevation changes.
Prepare a short specification sheet before requesting a quotation. Include table dimensions, extraction-zone details, material and thickness range, torch count, operating schedule, proposed collector location and a simple duct-route drawing. Ask suppliers to state the design airflow at the table, the fan’s operating static pressure, the assumed zone configuration and the filter arrangement.
Compare quotations on a like-for-like basis. Check whether each proposal includes the same table interface, ductwork scope, controls, filter service requirements and installation assumptions. If the figures differ substantially, ask each supplier to explain the design basis instead of selecting the highest airflow or lowest price automatically.
When discussing a CNC plasma table fume extraction system with Moland, provide the table layout, cutting details and proposed duct route so the project can be assessed against its actual operating requirements. Ask for the airflow and static-pressure basis, zone-control assumptions, collector and filter configuration, and any site information needed to confirm the selection. If some details are not yet known, identify them as open items rather than treating an early estimate as a final specification.
The right way to size a CNC plasma table fume extraction system is to establish the table’s required airflow, define the zones and operating conditions, and then select a fan and collector that deliver that airflow through the complete duct and filter system. Table area alone cannot provide a reliable final size, and a fan’s free-air rating does not confirm installed performance. Share your table, material, production and duct-route details with a qualified supplier, then compare proposals using the same design assumptions before placing an order.
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