For a single WAP installation, you could deploy a single FortiWiFi unit. If the site already has a FortiGate unit that supports the WiFi controller feature, adding a FortiAP unit is the most economical solution.

For a multiple WAP deployment you need a FortiGate unit as a WiFi controller and multiple FortiAP units. A FortiWiFi unit can be used as a managed WAP, but it is more expensive.

The FortiAP unit offers more flexible placement. FortiWiFi units either sit on a shelf or are rack mounted. FortiAP units can be attached to any wall or ceiling, enabling you to locate them where they will provide the best coverage.