How to use both 2.5GHz and 5GHz Wifi at the same time on FortiWifi

This article describes how to check if it is possible to use both 2.5Ghz and 5Ghz wifi at the same time on a FortiWifi model.

Scope

FortiWifi.

Solution

To use both 2.5GHz and 5GHz wifi on FortiWifi, it is necessary to have at least two radios on the FortiWifi model. So whether this setup will work depends on which FortiWifi model is used.
It is possible to get this information from the datasheet of the specific FortiWifi model.

For example, check the datasheet of FortiWifi 40F:
FortiGate FortiWiFi 40F Series

It lists the ‘Wireless Interface’ as ‘Single radio’ so this model cannot support both 2.5GHz and 5GHz wifi at the same time.

Check the datasheet for FortiWifi 80F:
FortiGate FortiWiFi 80F Series

It lists ‘Wireless Interface’ as ‘Dual Wifi Radio’ so this model can support both 2.5GHz and 5GHz at the same time.