Do you have to make door buckets for entrances to northern buildings?

Northern building entrance must do door bucket?

A: In order to indoor heat preservation, the entrance of the northern building must do the door bucket.

Door bucket: set up at the entrance and exit of the building to separate, wind, cold and other roles of the building transition space. In the winter time in the door outside the addition of a temporary square hut, with which to block the cold wind, which is called the door bucket.

"General Principles of Civil Building Design" GB50352-2005, in Chapter 7, Indoor Environment, 7.3 section of insulation, 7.3.3 cold areas of the building should be used to insulate the structure of the enclosure and should not be set up open stairwells and corridors, and its entrances and exits should be set up door buckets or take other measures to protect against the cold; cold areas of the building should not be set up open stairwells and corridors, and its entrances and exits should be set up door buckets or take other measures to prevent the cold; buildings should not be set up open stairwells and corridors, its The entrances and exits should be equipped with door buckets or take other measures to prevent cold.