... designed and manufactured according to GBII800-89 “Marine Explosion-Proof Axial Ventilators”, GB3836.1-2000 “Electrical Apparatus for Explosive ... GB3836.2-2000 “Electrical Apparatus for Explosive Atmosphere and Explosion-Proof Electrical Equipment “d””, and “Rules for Steel Sea Ship ... PRC and have got the certificate. Product Guide:Explosion-proof, safe and reliable in operation, well anti-corrosive, ...