"Fuel gas fitting" means "fuel gas fitting" as defined in RSA 153:27, IV, namely, "the installation, repair, alteration, service, demolition or removal of pipes, fixtures, fittings, appliances, equipment, or apparatus necessary for supplying natural gas or propane for residential or non-residential use from the point of delivery and all gas piping before connection to the combustion zone and including the applicable venting of flue gases to the outside atmosphere and the provisions for air for combustion and ventilation."
N.H. Admin. Code § Saf-Mec 102.10