306 - Service of notices and orders.

§ 306. Service of notices and orders.  Every notice or order issued by  the  department  relative  to a premises shall be served at least thirty  days before the time for compliance therewith. It  shall  be  sufficient  service  of  a  departmental  notice  or  order,  if  it  is posted in a  conspicuous place upon the premises affected and a copy thereof  mailed,  on  the  same  day it is posted, to the person to whom it is directed at  the address filed by him in the department, and, if his address  is  not  so filed in the department, then in such case, such notice shall be sent  by registered mail to his last known address or place of residence.