(a) Whenever it is certified by the board of health or other enforcing agency, that a tenement, lodging or boarding house, or any part thereof, is infected with communicable disease, or that it is unfit for human habitation or dangerous to life or health by reason of want of repair or of defects in the drainage, plumbing, ventilation or construction of the same, or by reason of the existence on the premises of a nuisance liable to cause sickness among the occupants of such house, the board of health or other enforcing agency may issue an order requiring all persons therein to vacate such house, or part thereof, within not less than twenty-four hours nor more than ten days. The board of health or other enforcing agency shall state in the order the reason for the issuance of the order.