Md. Code, Public Safety § 12–1102

This subtitle only applies to:

(1) a dwelling that:

(i) relies on the combustion of a fossil fuel for heat, ventilation, hot water, or clothes dryer operation; and

(ii) is a newly constructed dwelling for which a building permit is issued on or after January 1, 2008; or

(2) a hotel, a lodging or rooming house, or a rental dwelling unit.