2 sentences

1. 感觉通风口并检查是否有空气出来。

   gǎn​jué tōng​fēng​kǒu bìng jiǎn​chá shì​fǒu yǒu kōng​qì chū lai.

   Feel the vents and check if there is air coming out.

   Source: CCMatrix

2. 确保所有房间通风良好，通风口没有堵塞。

   què​bǎo suǒ​yǒu fáng​jiān tōng​fēng liáng​hǎo, tōng​fēng​kǒu méi​yǒu dǔ​sè.

   Make sure all rooms are well ventilated and that vents are not blocked.

   Source: CCMatrix