"Furnace" means a self-contained, indirect-fired appliance that supplies heated air to a building through ducts to conditioned spaces and that has a heat input rate of less than 225,000 Btu/hr.
N.H. Admin. Code § Env-A 4702.19
#9481, eff 5-23-09; ss by #10469, eff 1-1-14 (from Env-A 4702.18)