An experiment with air pressure.

AI Thread Summary
Blocking airflow to a heated fan with a piece of paper caused it to shut off due to overheating. The fan has a thermal switch that protects it from damage by cutting power when temperatures rise too high. After removing the obstruction, the fan remained off for about five minutes as the thermal switch needed time to cool down and reset. This phenomenon is similar to hair dryers, which also require adequate airflow to prevent overheating. Proper airflow is essential for the fan's operation and longevity.
jaydnul
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Im at work and i have a heated fan by my side. I decided to do a small experiment with air pressure. I placed a piece of paper at the back of the fan to block in coming air and the whole fan shut off and wouldn't come back on for 5 minutes. What happened inside the fan that made it turn off? If it was a circuit breaker, wouldn't it just turn back on immediately after i removed the paper?
 
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The reduced air flow caused the fan to over heat, and it has a thermal switch to protect it. It then takes some time for the switch to cool down and reset. Same think happens with hair dryers - we used them dry boots, and you had to fan a way that alloed enough air flow to prevent a shut off.
 
The heat has to be dissipated in order to keep everything working within the fan. So if you place the paper behind, it reduces the flow of air thus causing fan to over heat. So, you need some time for it to cool and to reset.
 
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