> For the complete documentation index, see [llms.txt](https://docs.betterbuilding.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.betterbuilding.io/user-guide/2d-building/building/hvac/space-hvac/fan-coil-unit-1.md).

# Fan Coil Unit

A Fan Coil Unit (FCU) incorporates a fan and a cooling coil to manage space temperature effectively. Air cooling controls the thermal environment, enhancing comfort and adaptability.

<figure><img src="/files/xT7NyWAxfeRcb0OOVmpr" alt=""><figcaption></figcaption></figure>

<figure><img src="/files/QdwlT8y9wyM56WmpQoml" alt=""><figcaption></figcaption></figure>

### Outdoor Air / Person

Specify the outdoor air flow rate for each zone in terms of litres per second per person.

### Supply Fan Total Efficiency

Specify the total efficiency of the supply fan.

### Supply Fan Delta Pressure

Specify the pressure rise in pascals at full flow and standard conditions.

### Supply Fan Motor Efficiency

Specify the shaft power of the supply fan divided by the electrical power consumed.

{% hint style="info" %}
Only on Premium Plans. Please reach for further [support](https://app.gitbook.com/o/WS5BGzA70OvplUrfmCf1/s/fKJnzF2TwHA3APPbiCpF/~/changes/232/support-and-training/contact-us).
{% endhint %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.betterbuilding.io/user-guide/2d-building/building/hvac/space-hvac/fan-coil-unit-1.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.