The channel widths vary depending on the WiFi standard. For example, in the (wireless networking standards) 802.11n and 802.11ac, the standard channel widths are 20, 40, 80, and 160 MHz. 40 MHz can carry twice as much data as 20 MHz while being more susceptible to interference. 80 MHz can have twice as 40 MHz, and so on. dPJ5o.