Utah Admin. Code 307-356-4
The following additional definitions apply to R307-356:
"Fan type central furnace" means a self-contained space heater providing for circulation of heated air at pressures other than atmospheric through ducts more than ten inches in length that have rated heat input capacity of less than 175,000 BTU per hour and that require single phase electric supply.
"Fireplace" means a vented or non-vented gas appliance, including freestanding, recessed, zero clearance, or a fireplace insert, that simulates a solid fuel fireplace.
"Rated heat input capacity" means the gross heat input capacity specified on the nameplate of either the unit or the burner.
"Recreational vehicle" means a motor home, travel trailer, truck camper, or camping trailer, with or without motive power, designed for human habitation for recreational, emergency, or other occupancy.
Utah Admin. Code R307-356-4