Some category for cooling fan from 3 ways.

Some category for cooling fans from 3 ways:
1.According to the type and air flow
It’s include Axial fan and blower fan
2.According to the working current
It’s include DC fan and AC fan
3.According to the useful for the cooling fan
It’s can separate into power fan,case fan,soundbox fans,car fans,desk top fan,notebook fan, vga fan, gpu fan,service fan, pda fan. led fan and so on.
In addition: the DC fan can separate more clearly:
a) According to the voltage: dc 5v,12v,36v,48v….
b) According to the wire and useful: 2pin,3pin(FG),4pin(FG,PWM)
c) According to the outside size: 25MM,30MM,40MM,50MM,56MM,70MM..
d) According to electrical system: bearing system, ironcore system, it’s can get more categories.
Some category for  cooling fans from 3 ways:

1.According to the type and air flow
It’s include Axial fan and blower fan
2.According to the working current
It’s include DC fan and AC fan
3.According to the useful for the cooling fan
It’s can separate into power fan,case fan,soundbox fans,car fans,desk top fan,notebook fan, vga fan, gpu fan,service fan, pda fan. led fan and so on.
In addition: the DC fan can separate more clearly:
a) According to the voltage: dc 5v,12v,36v,48v….
b) According to the wire and useful: 2pin,3pin(FG),4pin(FG,PWM)
c) According to the outside size: 25MM,30MM,40MM,50MM,56MM,70MM..
d) According to electrical system: bearing system, ironcore system, it’s can get more categories.