How does the 50% rule work?
In the UK there is no restriction on the size of a shelter or the size of its roof. However to limit smoke build-up and thus secondary passive smoke inhalation, the sides of the shelters may not form more than 50% enclosure of the shelter. In simple terms, the shelter may have only two sides, either a back and one side or a back and two half sides. All No Butts® our smoking shelters fully conform to this ruling and are effectively less than 50% enclosed regardless of side panel configuration. No Butts® waiting shelters should not be used for smoking areas as they are over 50% enclosed and thus should be designated “No Smoking Areas”. Signs to this effect must also be used in conjunction with these shelters.
