1.35years production experience,skilled. 2.ISO9001:2000-GB/T19001:2000 certified,stable operation and safe 3.YINCHANG brand 1.WNS horizontal inner-combustion boiler series are adopted advanced tri-backhauling & wet-back structure .which greatly improve the stability 2.Pliable corrugated furnace together with dual-backhauling spirally tube extend the heating surface ,keep sufficient power and good ...