These are the 5GHz channels that are legally allowed in the Philippines: 36, 40, 44, 48, 52, 56, 60, 64, 149, 153, 157, 161. These are the same channels that are allowed in the US. In some routers, like the Archer C7 in particular, you can set your country of use which should take care of this provided all your devices are adherent to the same standards.