... agent 4)fire class:1A34B 4kg automatic dry powder fire extinguisher refill machine specification:1)model: 4kg2)fire class: 1A34B3)driving ... main business scopes are as follows:A.Fire extinguisher1.Portable dry powder fire extinguisher 1kg,2kg,3kg,4kg,5kg,8kg2. ... extinguishing agent 25kg,40kg,1t2.BC dry powder fire extinguishing agent 25kg,40kg,1t3.Superfine dry powder fire extinguishing agent 25kg, ...