The fan inside the projector which uses active cooling cannot remove heat efficiently if the surrounding air is too hot. Another issue is the noise that can be heard directly.
We have been testing the blade thousands of times to finally find a way to improve efficiency. Due to the increasing fan pressure and air flowing under the same frequency of speed, the noise is turned to be much lower. The cooling fan comes equipped with high-temperature resistant electronic materials, which enhance the service life of a cooling fan.