Dude\ girl it's pretty obvious that you need to clean the dust off of the fans vent whatever You Said That: 1. the fan had never been cleaned 2. it's caked with dust 3. There's a high pitch sound coming from the vent during use 4. and it heats up very quickly A. you need to clean it asap. And you could clean every 5-6 months because that fan could get dusty over time and could catch fire. If your not really sure what to do just call the HVAC Service . Hoped I helped.