The PAN9020 (Wi-Fi 2.4G 802.11b/g/n Radio Module) and the PAN9320 (Wi-Fi 2.4G 802.11b/g/n Embedded Module) have a TX Output power of +18dBm in 11b. These products supporting 11n (20/40MHz bandwidth) with high throughput datarates up to 150Mbps.
Currently we don't support the Wi-Fi 5G 802.11a/n and/or 802.11ac standard. At the end both 802.11a/n and 802.11ac standards are using the frequency ranges of U-NII-1/-2/-3 bands from 5.150 GHz up to 5.825GHz.
In terms of the question to range and data rates please find a useful link to wiki page: https://en.wikipedia.org/wiki/IEEE_802.11
Further the TX power is restricted by the regulatory domain where the product will operate. For instance Europe (R&TTE/RED), USA (FCC) and Canada (IC/ISED) have different power limitations and frequency ranges.