Supply proof mobile multi-purpose fan IIB, devaluation Shanghai quantity Giant. Supply proof ventilation equipment, the amount giant explosion-proof mobile multi-purpose fan supply explosion-proof ventilation equipment, the amount of giant explosion-proof mobile multi-purpose fan supply explosion-proof ventilation equipment, the amount giant explosion-proof mobile multi-purpose fan BYDF32 Series Explosion-proof portable multi-purpose fan applies applicable to contain the level of the scope and purpose of flameproof Ⅱ A, Ⅱ B grade temperature group T1 ~ T4 explosive gas mixture, divided into the danger zone for Zone 1, Zone 2 places, such as chemicals, oil refining, ship factory ventilation change gas with Ex logo d Ⅱ BT.