Abstract: An enclosure adapted to be mounted on a generally vertical surface such as a wall. The enclosure has housing with a first opening in one of its sides and a second opening in another of its sides. The side with the second opening has a first mounting member and a second mounting member. In use, a first bracket is combined with the vertical surface by fastening members. The first bracket has an opening or slot along its top surface adapted to receive the first mounting member of the enclosure housing. A second bracket, which may be similar to the first bracket, is adapted to be inserted into the housing through the first opening after the enclosure housing is hung on the first bracket. The second bracket is secured to the vertical surface so that it receives the second mounting member which prevents the housing from being lifted off of the first bracket.