1. There are three main types of exhaust fans that can be circulated in the market. They are 1380*1380*400mm1.5kw, 1220*1220*400mm1.0kw, and 1060*1060*400mm0.75kw.

2, the rotation can be divided into belt-type rotation and direct motor rotation two. The belt-type rotating exhaust fan rotates at a speed of 400 to 450 rpm, which is characterized by low noise. The motor rotates the exhaust fan directly and rotates at a high speed of 440-720 rpm.

3, from the structure of the leaves, mainly five leaves, six leaves, seven leaves three structures.