> For the complete documentation index, see [llms.txt](https://docs.kemperconnect.de/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.kemperconnect.de/asset-types/cleanairtower/history.md).

# history

The History tab displays performance trends for the self-cleaning Clean Air Tower, showing volume flow, device status, and cleaning events over time.

## Accessing History

Navigate to the device detail page and select the "History" tab.

## Performance History Chart

### Chart title

"Volume Flow History (24 Hours)"

### Chart subtitle

"Air volume flow and operating status over time"

### Data series

| Series              | Description              |
| ------------------- | ------------------------ |
| **Volume Flow**     | Air flow rate in m³/h    |
| **Device Status**   | On/Off state (area fill) |
| **Cleaning Cycles** | Filter cleaning events   |

### Chart legend

| Element          | Description                      |
| ---------------- | -------------------------------- |
| Volume Flow line | Air volume being filtered        |
| Status area      | Device operating state           |
| Cleaning markers | Automatic filter cleaning cycles |

## Time range

Default: 24-hour view. Options:

* 24 hours (detailed)
* 7 days (hourly)
* 30 days (daily)

### Data resolution

| Range    | Resolution            |
| -------- | --------------------- |
| 24 hours | 5–15 minute intervals |
| 7 days   | Hourly aggregates     |
| 30 days  | Daily aggregates      |

## Reading the chart

### Volume Flow line

* Shows filtration rate over time
* Higher values = more air processed
* Drops to zero when device off

### Status area

* Shaded when device is on
* Clear when device is off
* Correlates with volume flow

### Cleaning events

* Markers indicate cleaning cycles
* Shows filter maintenance activity
* Normal operation has periodic cleaning

## Chart interaction

### Hover details

* Exact value at cursor
* Timestamp
* Status state

### Legend toggle

* Click to show/hide series
* Focus on specific metrics

## Historical patterns

### Normal operation

* Consistent flow when running
* Regular cleaning cycles
* Expected on/off patterns

### Potential issues

* Declining volume flow
* Increased cleaning frequency
* Irregular patterns
* Zero flow when on

## Use cases

### Performance monitoring

* Track filtration consistency
* Identify efficiency changes
* Monitor cleaning frequency

### Maintenance planning

* Predict service needs
* Observe filter loading
* Plan interventions

### Compliance

* Historical records
* Operating time documentation
* Performance verification

## Related documentation

* [Dashboard](broken://pages/415d6ce9d130a8b6702073901ddc80c6b9901ab3) - Current status
* [Settings](broken://pages/77771dd7529569caf13202321a8310a71766035b) - System info
* [Service](file:///monitoring/service/overview.md) - Maintenance


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