(b) As used in this part:

1. (1) “Chimney” means a vertical structure constructed of masonry, either lined or unlined, for the purpose of carrying away products of combustion from an appliance burning gas as fuel;

2. (2) “Draft hood” means a device placed in and made a part of the flue pipe from an appliance, or in the appliance itself, which is designed to:

   1. (A) Ensure the ready escape of the products of combustion in the vent of no draft, back draft, or stoppage beyond the draft hood;
   2. (B) Prevent a back draft from entering the appliance; and
   3. (C) Neutralize the effect of stack action of the chimney flue upon the operation of the appliance;
3. (3) “Crossover” or “offset” means any deviation from the vertical rise of the vertical vent, necessitating one (1) or more fittings;

4. (4) “Gas floor furnace” means a completely self-contained-unit furnace, excluding those having additional or separate returns:

   1. (A) Suspended from the floor of the space being heated;
   2. (B) Taking air for combustion from outside this space; and
   3. (C) With means for observing flames and lighting the appliance from the space being heated;
5. (5) “Gas-pressure regulator” means a device for controlling and maintaining a uniform pressure on a gas supply;

6. (6) “Horizontal-vent connection” means a pipe designed to carry the products of combustion and which runs in a generally horizontal direction from the vent collar of gas furnace to the:

   1. (A) Vertical vent;
   2. (B) Flue; or
   3. (C) Chimney;
7. (7) “Important building”. Definition adopted by reference NFPA 58 Annex A, A.6.4.1.1 with the following additional language:
8. (6) Any building wired for electricity. A building “wired for electricity” consists of an electrical wiring system that distributes energy to be used for equipment, lighting, or appliances in the building. “Wired for electricity” also involves the proper installation, operation, and existence of electrical outlets, switches, breakers, meter base and different electrical circuits for the building.

9. (8) “One-hundred-percent-automatic safety pilot” means a device for:

   1. (A) Shutting off, automatically, the gas supply to the main burner and pilot in the event of a pilot or gas failure; and
   2. (B) Preventing the gas from being fumed into the main burner unless the pilot is ignited (required for liquefied petroleum gases);
10. (9) “Vent collar” means a means provided to connect the vent pipe to the furnace; and

11. (10) “Vertical vent” means a pipe:

    1. (A) Designed to carry the products of combustion; and
    2. (B) Which rises in a vertical direction from an appliance or horizontal vent connection.