Optional 24V DC Cooling Fan necessary information

1, "24V DC Cooling Fan" pressure value.
2, the fan size.
3, to determine the fan is DC or AC.
4, "24V DC Cooling Fan" balls or oil-bearing in the form of wind turbines.
5, the fan supply voltage value, for example: AC 220V, 110V, 380V DC 5V, 12V, 24V, 36V, 48V.
6, "24V DC Cooling Fan" speed, for example, wind turbines, how many cubic meters, or how many cubic feet per minute per minute.