It a PC fan, of course its a DC
You need to find a AC/DC adapter and connect it to the fan.
I use 12V , do the speed is faster.

Normal temp that I got is about 28 to 29C
26 C sometime can be achieved on rainy or cloudy day.
The effect is better on dry day because with fan is we are applying water evaporative properties to cool down the water.
In dry day, more water will evaporate, so more heat energy will be absorbed by the water in the surface when the become vapors.
Bigger surface area also help water to cool down the water more.

This is my top of the list shop . 80% of my plant came from that shop. Dealing with them since last year, good price also, recommended seller . Next will buy some CRS from them too.

Just sharing,

- my shrimp keep dying..
- Already use the air pump to aerate it.
- result is better that not using it, but the shrimp is still dying..
- i did water top off everyday because of the fan and do 20% water change every 2 days..
- i also didn't user any fert.
- but still the shrimp is dying.
- im using filtered tab water..
- average temp is about 28C to 27C
- it is because of the copper in the tap water that cause this?

AHHHHHHHHHHHHHHHH!!! sien... everytime also kena BBA... why not other algae... everytime BBA ~.~