A minimum of two clearly marked exits shall be maintained from each floor during the abatement process. The second exit from a containment area may be covered with plastic upon approval of the Fire Department and the Department of Building and Safety. The covered exit shall be outlined with red duct-type tape, and a cutting device shall be kept immediately adjacent to the door in an obvious and readily accessible location. The cutting device shall also be surrounded by a square of red duct-type tape as described above.