Page 638 - 2018_IRC

FUEL GAS

the unit heater has an internal draft hood or 1 inch (25 mm) SECTION G2446 (622)
above the top of the sloping side of the vertical draft hood. VENTED ROOM HEATERS
Floor-mounted-type unit heaters shall be installed with G2446.1 (622.1) General. Vented room heaters shall be
clearances to combustible materials at the back and one side tested in accordance with ANSI Z21.86/CSA 2.32, shall be
only of not less than 6 inches (152 mm). Where the flue gases designed and equipped as specified in Section G2432.2 and
are vented horizontally, the 6-inch (152 mm) clearance shall be shall be installed in accordance with the manufacturer’s
measured from the draft hood or vent instead of the rear wall of instructions.
the unit heater. Floor-mounted-type unit heaters shall not be
installed on combustible floors unless listed for such installa-
tion. SECTION G2447 (623)
COOKING APPLIANCES
Clearances for servicing all unit heaters shall be in accor-
dance with the manufacturer’s installation instructions. G2447.1 (623.1) Cooking appliances. Cooking appliances
that are designed for permanent installation, including ranges,
Exception: Unit heaters listed for reduced clearance shall ovens, stoves, broilers, grills, fryers, griddles, hot plates and
be permitted to be installed with such clearances in accor- barbecues, shall be tested in accordance with ANSI Z21.1 or
dance with their listing and the manufacturer’s instructions. ANSI Z21.58/CSA 1.6 and shall be installed in accordance
with the manufacturer’s instructions.
SECTION G2445 (621) G2447.2 (623.2) Prohibited location. Cooking appliances
UNVENTED ROOM HEATERS designed, tested, listed and labeled for use in commercial
occupancies shall not be installed within dwelling units or
G2445.1 (621.1) General. Unvented room heaters shall be within any area where domestic cooking operations occur.
tested in accordance with ANSI Z21.11.2 and shall be
installed in accordance with the conditions of the listing and Exceptions:
the manufacturer’s instructions. 1. Appliances that are also listed as domestic cooking
appliances.
G2445.2 (621.2) Prohibited use. One or more unvented
room heaters shall not be used as the sole source of comfort 2. Where the installation is designed by a licensed Pro-
heating in a dwelling unit. fessional Engineer, in compliance with the manufac-
G2445.3 (621.3) Input rating. Unvented room heaters shall turer’s installation instructions.
not have an input rating in excess of 40,000 Btu/h (11.7 kW). G2447.3 (623.3) Domestic appliances. Cooking appliances
G2445.4 (621.4) Prohibited locations. The location of installed within dwelling units and within areas where domes-
unvented room heaters shall comply with Section G2406.2. tic cooking operations occur shall be listed and labeled as
household-type appliances for domestic use.
G2445.5 (621.5) Room or space volume. The aggregate
input rating of all unvented appliances installed in a room or G2447.4 (623.4) Range installation. Ranges installed on
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space shall not exceed 20 Btu/h per cubic foot (207 W/m ) of combustible floors shall be set on their own bases or legs and
volume of such room or space. Where the room or space in shall be installed with clearances of not less than that shown
which the appliances are installed is directly connected to on the label.
another room or space by a doorway, archway or other open- G2447.5 (623.7) Vertical clearance above cooking top.
ing of comparable size that cannot be closed, the volume of Household cooking appliances shall have a vertical clear-
such adjacent room or space shall be permitted to be included ance above the cooking top of not less than 30 inches (760
in the calculations. mm) to combustible material and metal cabinets. A minimum
clearance of 24 inches (610 mm) is permitted where one of
G2445.6 (621.6) Oxygen-depletion safety system. Unvented
room heaters shall be equipped with an oxygen-depletion- the following is installed:
sensitive safety shutoff system. The system shall shut off the 1. The underside of the combustible material or metal cab-
gas supply to the main and pilot burners when the oxygen in inet above the cooking top is protected with not less than
the surrounding atmosphere is depleted to the percent con- 1 / -inch (6.4 mm) insulating millboard covered with
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centration specified by the manufacturer, but not lower than sheet metal not less than 0.0122 inch (0.3 mm) thick.
18 percent. The system shall not incorporate field adjustment 2. A metal ventilating hood constructed of sheet metal not
means capable of changing the set point at which the system less than 0.0122 inch (0.3 mm) thick is installed above
acts to shut off the gas supply to the room heater.
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the cooking top with a clearance of not less than / 4
G2445.7 (621.7) Unvented decorative room heaters. An inch (6.4 mm) between the hood and the underside of
unvented decorative room heater shall not be installed in a the combustible material or metal cabinet. The hood
factory-built fireplace unless the fireplace system has been shall have a width not less than the width of the appli-
specifically tested, listed and labeled for such use in accor- ance and shall be centered over the appliance.
dance with UL 127.
3. A listed cooking appliance or microwave oven is
G2445.7.1 (621.7.1) Ventless firebox enclosures. Vent- installed over a listed cooking appliance and in compli-
less firebox enclosures used with unvented decorative room ance with the terms of the manufacturer’s installation
heaters shall be listed as complying with ANSI Z21.91. instructions for the upper appliance.

2018 INTERNATIONAL RESIDENTIAL CODE ® 613
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