Aluminium alloys and titanium processing brings about magnesium dusts and oxides.Such dusts in a particular concentration, if in contact with an ignition source (e.g.: spark, flame or electric discharge) can give rise to a deflagration with variable power depending on the quantity of dust.Series R dust collectors for aluminium alloys are suitable for this type of application, as they are provided with a reinforced structure as well as with calibrated venting systems for the overpressure caused by a possible deflagration.