3 sentences

1. 风扇有助于电脑散热。

   fēng​shàn yǒu​zhù​yú diàn​nǎo sàn​rè.

   The fan helps with the computer's heat dissipation.

   Source: Dong Chinese Dictionary

2. 天气太热了，请打开风扇。

   tiān​qì tài rè le, qǐng dǎ​kāi fēng​shàn.

   It's too hot; please turn on the fan.

   Source: Dong Chinese Dictionary

3. 这种风扇可以帮助室内快速降温。

   zhè zhǒng fēng​shàn kě​yǐ bāng​zhù shì nèi kuài​sù jiàng​wēn.

   This fan can help cool down the room quickly.

   Source: Dong Chinese Dictionary