Extraction is the part of a woodworking shop that gets planned last and causes the most trouble afterwards. A good machine on an undersized extraction system will burn edges, clog, and fill the room with the fine dust that matters most for health.

Start from the machine's port diameters

Every machine states the diameter of its extraction ports, and the manufacturer chose it for a reason. A wide belt sander, a spindle moulder and a panel saw all demand different air volumes, and connecting them all to one thin duct simply moves the bottleneck out of sight. When you look at a used machine, note every port, not just the main one — many machines extract from two or three points at once.

Volume, velocity and duct runs

  • Air volume decides whether the chips leave the cutter at all.
  • Air velocity in the duct decides whether they keep moving instead of settling in a horizontal run.
  • Every bend, flexible hose and blast gate costs pressure — long flexible sections are the most common hidden loss.

Keep flexible hose short, use swept bends rather than sharp elbows, and place the extractor so the main run is as direct as possible.

Filtration is a health question

Coarse chips are the visible problem; fine wood dust is the one that reaches the lungs. Hardwood dust is classified as carcinogenic in the EU, and workshops have legal exposure limits. That makes the filter class of the extractor, not just its airflow, part of the purchasing decision. Bag-only systems that leak fine dust back into the room are a false economy.

Extraction is not an accessory to the machine — for anything that produces fine dust, it is part of the machine.

Practical checks when buying used

  • Are the original hoods and internal ducting still fitted, or were they removed?
  • Does the machine have an interlock or signal contact for the extractor?
  • On CNC machining centres: is the dust shoe intact and does it follow the head properly?
  • Is there a bag or cartridge filter, and when was it last changed?

Plan for noise as well

Extractors are loud, and in most shops they run all day. Placing the unit outside the working area or in an acoustic enclosure is cheaper to do during installation than a year later.

See the woodworking machines currently in stock — the listings state the port diameters, so you can check compatibility before you travel.