> For the complete documentation index, see [llms.txt](https://btehkmu.gitbook.io/btehkmu-zhi-nan-guide-book/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://btehkmu.gitbook.io/btehkmu-zhi-nan-guide-book/guide-book-en/getting-started/understand-details/exterior-wall-details.md).

# Exterior Wall Details

Now we can deal with the air conditioners and pipes on the exterior walls.

![](https://2481641337-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FiCsqZvQt6N8bYG3CEYIb%2Fuploads%2FwogQl4w7IWz3Dxn9Wfe6%2Funknown.png?alt=media\&token=34892c6d-da6b-4e1a-8d58-a785d34dda93)

<details>

<summary>But I don't know their exact location, what should I do?</summary>

{% hint style="info" %}
/tpll can not only be used to locate corners of a building, you can also precisely find where a detail on the building is, for example the position of a chair placed on the roof.
{% endhint %}

</details>

![](https://2481641337-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FiCsqZvQt6N8bYG3CEYIb%2Fuploads%2FGsjF5WSGahY3uOK7slZB%2Funknown.png?alt=media\&token=6e49e89d-0ccb-4cec-8ee1-9a25c88d2560)

<details>

<summary>Exterior wall air conditioners can use custom heads, so how do you find them? </summary>

## HeadDataBase

Open the HDB page

{% code fullWidth="false" %}

```
/hdb
```

{% endcode %}

**The yellow box is usually the category we use for buildings**\
![](https://2481641337-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FiCsqZvQt6N8bYG3CEYIb%2Fuploads%2FElMFi0VlRXjQHn6dAtpq%2Fimage.png?alt=media\&token=4c7ac734-cfda-4722-bdf4-7cabbad1ea7d)Of course there are other heads, you can search for them yourself.

```
/hdb search 
```

Type the name you want to find after the command

</details>