No person, firm or corporation shall place, deposit, leave,
expose for sale or otherwise display any goods, wares or merchandise
of any nature or description on any premises adjacent to a street
or sidewalk unless the same are at least 30 inches above the level
of the ground under the same and unless such goods, wares and merchandise
are completely and entirely covered with and by netting, screen or
other material to protect them from dust, dirt and other foreign matter.