Section R. 339.5161 - Mechanical specialty license classificationsRule 161.
(1) A mechanical specialty license is a license limited to a specific type of mechanical installation. Specialty licenses are not required if the work is covered under a different license classification, as follows: (a) Limited to solar heating and cooling. Solar heating and cooling means the installation of equipment and systems intended to utilize solar energy for space heating or cooling.(b) Limited to solid fuel and vented decorative gas appliances. Solid fuel equipment and vented decorative gas appliances means the installation of equipment that utilizes combusted solid fuel to produce heat or a vented fuel gas appliance in which the primary function lies in the aesthetic effect of the flames.(c) Limited to liquified petroleum gas (LP) distribution piping. LP distribution piping means it is limited to the installation of fuel gas piping from the outlet of the first stage regulator to the inlet of the second stage regulator.(d) Limited to fuel gas piping. Fuel gas piping means the installation of piping, valves, and fittings from the outlet of the point of delivery to the outlet of the appliance shut off valve used to convey natural gas, manufactured gas, LP, or a mixture of these gases.(e) Limited to fuel gas piping and venting. Fuel gas piping and venting means the installation of fuel gas piping and the installation of a continuous open passageway from the flue collar or draft hood of an appliance to the outside atmosphere for the purpose of removing flue or vent gases.(2) An individual who holds a heating, ventilation and air conditioning (HVAC) equipment license is not required to obtain a specialty license limited to solid fuel and vented decorative gas appliances, LP distribution piping, solar heating and cooling, fuel gas piping, or fuel gas piping and venting.Mich. Admin. Code R. 339.5161