Greetings friend. Generally are three fans that go in a projector ... if you suspect the fan in question places the others and takes one that is the same and change them of place and turns on the projector again if the noise repeats is not the fan but if it is repeat then yes. But you should turn it on and off several times to be sure. Check if that vantiladora has no hair or threads stuck in the pin that supports the fan or that some wire is not sticking in the blade.