1: energy saving, solar energy 2; model no. ... .94220/380671450*1450*660 1.with scientific trumpet design,low noise ,large air flow and strong force of drawing ... downstream,anti-oxidation,light weight,ametabolic.3.flexible open and anti-air-back.4.Aluminum alloy wheel hub : ... ,non-fractured,beautiful and durable.7.special trumpet fan direct type motor.8.plating round support structure,the smallest wind ...