Explosion-proof portable multi-purpose fans, the most important Shanghai giant. Explosion-proof ventilation equipment, applicable amount giant explosion-proof mobile multi-purpose fan, Explosion-proof ventilation equipment, the amount of giant explosion-proof mobile multi-purpose fan, Explosion-proof ventilation equipment, the amount of giant explosion-proof mobile multi-purpose fan BYDF32 Series Explosion-proof mobile multi-purpose fan scope and purpose: flameproof containing level as II A, II B-level temperature class T1 to T4 group explosive gas mixtures classified hazardous area Zone 1, Zone 2 places, such as chemical, oil refining, shipbuilding and other factory ventilation ventilation, explosion-proof mark for d Ⅱ BT4.