3X4 Downdraft Tables

Required CFM depends on the size of the work surface and the capture velocity needed for your process — heavier fume-generating work like welding typically needs more air movement per square foot than light sanding. As a general reference, our own Downdraft Tables line ranges from a 1,200 CFM Mini model up to 6,300 CFM on our largest 3'x8' and 4'x8' tables. Our team can size a table to your specific application; contact us for a recommendation.

A dry downdraft table pulls dust and fume through dry filter media, while a wet downdraft table (like our Storm series) draws air through a water bath, which captures sparks and combustible dust before they reach a filter. Wet tables are generally the safer choice for processes that generate hot sparks, aluminum or magnesium dust, or other combustible fines where a dry filter would pose an ignition risk.

A wet scrubber routes contaminated air through a water bath or spray chamber rather than dry filter media, which makes it well suited to overspray from spray painting, and to dusts that are combustible, sticky, or otherwise poor candidates for dry filtration. Our Camfil Handte Wet Scrubbers line includes Vortex, Vortex Dual, and Venturi models for different airflow and contaminant loads.

Hexavalent chromium is generated when welding or cutting stainless steel and other chromium alloys, and OSHA regulates exposure under 29 CFR 1910.1026. Source capture with a properly sized downdraft table or fume extraction system is the primary engineering control; see our Safety guide to Hexavalent Chromium for exposure limits and a fuller overview.