"AC Fan" Before installation, be sure to check the packaging is not intact, fans outside the nameplate parameters and the description is not consistent, is not satisfactory. Description equipped with various accessories are complete; check whether the fan body deformation damage during transportation handling and other processes and other phenomena, whether there are solid pieces off loose phenomenon, especially if there is an impeller collision phenomenon, "AC fan" whether the various parts shortage, if any problems found before installation, it is best to contact the manufacturer or be equipped with supplementary; use 500v megohm meter to measure the insulation resistance of the fan housing and motor windings, guaranteed to give more than 0.5 megohms, if not this value should be the motor windings for drying, remember not to exceed a temperature of 120 degrees Celsius; prior to installation "AC Fan", will be used to prepare in advance a variety of materials and tools, be sure to choose suitable installation site and location.