It shall be the duty of the Department of Public Health, upon application from any person, firm, or corporation desiring to open, conduct or continue any place of business connected with the making, remaking and sale of mattresses, within the limits of the City and County of San Francisco, before issuing the certificate specified in Section 670, to cause the premises on which it is proposed to carry on such business, or in which said business is being carried on or conducted, to be inspected with a view of ascertaining whether said premises are in a sanitary condition for the conduct of said business and comply with the ordinances of the City and County of San Francisco.