Orders should be issued insuring safety installation and operation of ranges, stoves, and heaters. Ventilators should be screened and buildings boarded to the ground so sparks cannot enter. Sewage The sewage system should be for sewage only and not for drainage in addition thereto. Trunks and outfalls should have a minimum mean velocity of 2 feet per second. Six inch pipe should be used for building connection.
Grease traps are necessary.
Minimum cover for sewer lines should be not less than two feet. It is assumed that buildings constructed will be of the cantonment type in use during the World War. Modifications to suit a peculiarity of the building site are determined in the field. In designing these buildings standard commercial lengths of lumber are used, hence widths for one story buildings are 20 feet, with seven foot bays, and widths of 30 to 42 feet, with bays of 8 or 10 feet in the case of two story buildings. Doors are 2 feet 8 inches by 6 feet 8 inches.