The onset of fire (abnormal smell, faint smoke) was detected around 10:30 am in one of a silo’s 2 grain dryers while the technician was performing, in accordance with operating guidelines, grain extraction by starting up the lower burner in order to prevent the corn from stagnating. The internal safety procedure in the event of fire was activated, in: shutting down the burner and all fans, suspending gas supplies, closing air inlets. In noticing that filters on the 1st floor were turning red, the technician used 3 water extinguishers and then alerted municipal first responders. Dryer drainage was quickly initiated before the external response. Fire-fighters deployed 2 hoses hooked up to the dry standpipe. Around 11:40 am with no visible smoke, the remaining grains were drained by a bottom handling manoeuvre on the drying facility. The transfer operation concluded at 12:30 pm, after which fire-fighters verified the absence of hot spots both in the dryer and in the handling installation connected to the silo using a thermal camera. The stainless steel mesh filters between the burner and the grains were the source of this outbreak; some 15 brackets and the wall supporting these filters were also damaged. A malfunction when opening the burner’s air supply louvers, due to a failure of the jack, caused the burner to operate abnormally, followed by filter combustion. The silo operator scheduled the installation of louver opening detectors and a control to idle the burner should the louver remain shut.