On and after July 14, 1952, every gas appliance and its accessories designed for domestic use, installed in the town must be constructed as required in § 93.02.
(A) Location and air for combustion.
(1) Gas appliances shall be installed in a location in which the facilities for ventilation permit satisfactory combustion of gas and proper venting. (Reference is made to requirements for Air for Combustion stated in § 3.1.5 of the American Standard Installation of Gas Piping and Gas Appliances in Buildings, ASA Z 21.30-1950.)
(2) Unless equipped with an automatic pilot, space and central heaters shall not be installed in sleeping quarters, or used in rooms normally kept closed. Nor shall they be installed in a bathroom if any air needed for combustion or venting is taken from the bathroom, or if there is a possibility of bathroom air being diluted with flue products.
(3) Water heaters shall not be installed in bathrooms, bedrooms or any occupied rooms normally kept closed.
(4) Refrigerators shall be provided with adequate clearances for ventilation at the top and back. They shall be installed in accordance with the manufacturer’s instructions. If the instructions are not available, at least two inches shall be provided between the back of the refrigerator and the wall and at least a 12-inch clearance above the top. Refrigerators should not be located in sleeping rooms but if so, adequate ventilation to the outside air shall be provided.
(B) Appliances requiring flues or vents.
(1) Every gas appliance, except domestic gas ranges and domestic clothes dryers, shall be connected to an effective flue or vent if it is included in any of the following classifications:
(a) For gaseous fuels except liquefied petroleum gas.
1. Any appliance installed for domestic purposes having an input rating in excess of 5,000 BTU per hour. Where two or more appliances are installed in the same room or space then the aggregate input rating of unvented appliances shall not exceed 30 BTU per hour per cubic foot of the room or space;
2. Automatically controlled appliances which use less than 5,000 BTU per hour unless equipped with an automatic pilot or a flame-responsive fuel shut-off device; and
3. Gas-fired incinerators.
(b) For liquified petroleum gas.
1. Any domestic appliance with input rating in excess of 50,000 BTU per hour;
2. Any appliance with input rating in excess of 5,000 BTU per hour, if the input rating exceeds 30 BTU per hour per cubic foot of room or space in which the appliance is installed. Where two or more appliances are installed in the same room or space, then the aggregate input rating of unvented appliances shall not exceed 30 BTU per hour per cubic foot of the room or space. (Note: Where the room or space in which the appliance or appliances are installed, is directly connected to another room or space by doorway, archway or other opening of comparable size, which cannot be closed, then the volume of the adjacent room or space may be included in the above calculations);
3. Room heaters in sleeping quarters having aggregate input ratings in excess of 5,000 BTU per hour. These heaters must also be equipped with automatic pilots;
4. All space heating steam and hot water boilers and warm air furnaces, floor furnaces, recessed heaters, unit heaters and duct furnaces (not wall heaters);
5. Unlisted appliances having flue collars; and
6. Gas fired incinerators.
(2) Every vented appliance, except incinerators, dual oven type combination ranges (using a second fuel other than gas) and units designed for power burners or for forced venting shall have an approved type draft hood.
(C) Method of venting.
(1) The flue shall be of adequate size, and at least of the same area as the flue connector, but in no case shall the area be less than the area of a three-inch diameter pipe. Where more than one appliance is connected into the same flue, the area of the flue shall not be less than the area of the largest flue connector plus 50% of the areas of the additional flue connectors.
(2) For gas conversion burners in up-draft furnaces and boilers, the draft hood and flue pipe shall be sized according to dimensions listed in Table I. (For furnaces or boilers with revertible or diving flues, the size of the draft hood and flue pipe shall be subject to the approval of the official administering these requirements.)
TABLE I | |
(Based on not more than 6,500 BTU per square inch of flue area) | |
Input BTU per Hour | Draft Hood and Flue Pipe Sizes* |
TABLE I | |
(Based on not more than 6,500 BTU per square inch of flue area) | |
Input BTU per Hour | Draft Hood and Flue Pipe Sizes* |
Up to 120,000 | 5-inch |
120,000—160,000 | 6-inch |
160,000—250,000 | 7-inch |
250,000—320,000 | 8-inch |
320,000—410,000 | 9-inch |
* If the flue pipe exceeds 10 feet in length, or contains more than two elbows, use next size larger pipe and draft hood | |
(3) The installation of gas conversion burners in coal or oil burning ranges shall be made in accordance with good practice and in a safe manner.
(4) Outside flues not enclosed in chimneys shall when used be approved by the official administering these requirements, and the material shall be resistant to the action of combustion products and the flue shall possess high insulation qualities or be adequately insulated to minimize condensation and aid draft. (Note: Outside flues are not recommended. They are particularly unsuccessful in severe climates and in small sizes.)
(5) When a flue must be installed on the outside of the building, it shall be securely supported. A capped “tee” shall be installed at base of the riser with an opening to drain off condensate. A suitable vent cap which does not obstruct or reduce the effective cross-sectional area of the flue outlet shall be placed on top of the riser.
(6) The flue connector shall not be smaller than the size of the appliance flue collar. Where more than one appliance is connected to a flue connector, the area of the connector shall be equivalent to the combined areas of the flue connectors of all connected appliances.
(7) The flue connector shall be of non-combustible material, resistant to the corrosive action of flue gases and condensate.
(8) No manually operated damper shall be placed in any flue connector. Fixed baffles ahead of draft hoods are not classified as dampers.
(9) The flue connector shall maintain a pitch or rise from the appliance to the flue. A rise as great as possible, at least one-fourth inch to the foot (horizontal length) shall be maintained. The horizontal run shall be free from dips or sags.
(D) Appliance connections.
(1) All gaseous fuel except liquefied petroleum gas. Flexible tubing for appliance connections to building piping which depends for tightness on joint packing, or on any wall structure other than that formed by a continuous one-piece metal tubing member is prohibited. This shall not exclude the use of approved semi-rigid tubing or connectors of approved tubing or fittings within the limit as may be permitted by the official administering these requirements. (Reference is made to § 3.2 of the American Standard Installation of Gas Piping and Gas Appliances in Buildings, ASA Z 21.30-1950.)
(2) Liquefied petroleum gas. Liquefied petroleum gas appliance connections shall be made in an approved manner. (For liquefied petroleum gas, reference is made to National Board of Fire Underwriters Pamphlet No. 58; September, 1951, § B.7.)
(Ord. passed 6-23-1952; Ord. passed 12-19-1960)