Different fan uses material in external shell like:stainless steel,aluminum,steel,has big difference in manufacture cost.
Electric motor is one of the most important parts in the whole constructure of industrial fans.
Bearing housing and insert bearings are second important parts.Bearing applicant in industrail blower,draught fan so much.
Industrial blower require bearings could running well under high speed rotating and bear certain radial load.
These industrial fan bearings could have a capacity to work in the extremely high temperature or low temperature environment condition,also in some tough place very difficult to maintain.The airflow always takes material transport,with time flies,the material pastes on the impeller,cause the unbalance,what is more this would lead to reduce the equipment work-life and normal work condition.