Except as otherwise provided in this section 2, the owners or operators of a public place may designate an area outdoors for patrons' smoking, provided it is a minimum of 20 feet from any windows, entryways, doorways, vents or other openings or any outdoor area where smoking is prohibited by law, and not in a location that will allow circulation of secondhand smoke into the enclosed areas of a business facility or public place in any way, e.g., through the ventilation system, open windows, and open doors. An area for smoking outdoors may be constructed to protect patrons from the weather as long as it is not an "enclosed area" within the meaning of Section 1 of this rule.
10-144 C.M.R. ch. 249, § 2