Why do many people cover their routers with foil?

There are two key reasons why people wrap their routers in foil.

Electromagnetic radiation is the first reason.

Studies show that radiation from routers can reach 100 µW/cm2, which is ten times higher than safety standards for stationary electrical devices. This concerns some, who try to reduce radiation by not keeping the router in the bedroom or turning it off at night.

Foiling the router is ineffective and potentially dangerous. Initially, the foil will obstruct the WiFi signal, and subsequently, the disruption of its natural cooling process could lead to the device’s overheating.

The second reason is that foil is used as a screen to amplify and direct the Wi-Fi signal.

Some people use foil or aluminum cans as reflectors behind the router. In theory, this can work if the reflector is properly bent and positioned and the distance is adjusted according to the length of the router’s antenna or the wavelength of the signal. However, improper use of such a screen can damage the Wi-Fi transmitter.

Ultimately, if distance or obstacles are causing Wi-Fi issues, we recommend using a Wi-Fi repeater instead of DIY solutions. This is a more reliable and safe way to boost the signal.