It depends on the model of the projector!
The projector has an internal temperature monitoring system to check the heat generated by the projector lamp. When the heat is at its maximum levels , the cooling fans rotate the fastest and when it comes under control , the speed lowers!
if your projector does not goes into thermal shutdown then it means everything is normal and u do not need to worry!
also ensure that the air inlets and out lets should not be blocked to ensure smooth cold and hot air flow from the projector!
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