You're actually taking the exhaust, the exhaust is blowing on a small fan.

你实际上是在排气，排气吹动一个小风扇。

It means that they might have a few lights at home or a small fan, but no refrigerator, no water heater, no safe cookstove.

这意味着他们家里可能有几盏灯或一个小风扇，但没有冰箱、热水器和安全的炉灶。