O-1954-476 - Laserfiche WebLink

Browse Search

'" e t , ..... , "-.. ;~:.. . e -45- ". Cd) Appliances installed in the same room, which if not vented would make the total input rati:lg of unvented gas appliances, not including domestic gas ranges, as great as }) Btu per hour per cubic foot of room content. (e) Water heate::-s installed in bath rooms, bed rooms, or any occupied room normally kept closed. (f) Space heate:~s in sleeping quarters for use of transients. (g) All house h,:!ating sji"eam and hot water boilers and warm air fur- naces including floor furnaces. 2. TYPES OF FLm~~. (a) Type A fluen: Chimneys or metal smokestacks. Type A flues are required for: (1) all inc:inerators; (2) All applianc.es which may be con- verted readily to the use of solid or liquid fuel; (J) all boilers and fur- naces, other than attic furnaces, e..."tCept where specific approval is obtained from the building officia. for the use of type B gas vents; (4) all other appliances except approved appliances which produce flue gas temperatures not in excess of 5500 F. at the outlet of the draft hood vlhen burning gas at the manufacturers input rating. (b) Type B gas vents: Approved vent piping of noncombustible, corrosion-resi~tant material of adequate strength and heat insulating value, and having bell and spigot or othe-r acceptable joints. TyPe B gas vents shall be used on~ with approved gas appliances which are not required by paragraph (a) above to be vented to type A flues, except that they mB\Y' be used when ex- tended through an existing non-used chillDley, whether the chimney is lined or not lined. (c) Type C gas vents: Vent pipes of sheet copper of not less than 24 u. S. gauge or of galvalized iron of not less than 20 U. S. gauge or of other approved corrosion-resistant material, may be used for runs direct~ from the space in l'lhich the, appliance is located through a r.oof or ex: terior wall to the outer air. Such vent pipes shall not pass through any attic or concealed space nor thr ough any floclI'. This shaJJ. not be construed as prohibiting the use of such vent pipes to vent, attic furnaces installed in accordance :vi th the pro- v isions of this ordinancEl. Installation with reference to clearance from com- bustible material and pas::;age through wall or roof shall comply with the pro- visions of subsection 4 of this section. 3. INSTALLATION OF TYPE B GAS VENTS. (a) Type B gas vents shall be made up with tight joints.