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§ 1521.16 DWELLING HOUSE CODE 32 221.29-1941 Listing Requirements for Furnace Temperature Limit Controls and R 1950 Fan Controls. ' 221.30-1950 Installation of Gas Piping and Gas Appliances in Buildings. 221.32-1942 Listing Requirements for Gas Appliance Connectors of Flexible R 1950 Metal Tubing and Fittings: 221.34-1942 Approved Requirements for Gas-Fired Duct Furnaces, R 1950 1521.16 Standards of the American Water Works Association. C100-08 Standard Specifications for Cast-Iron Water Pipe~and Special Cast- ings. C204-50 Standard Specifications for Cold Tar Enamel Protective Coating. 1521.17 Standards of the American Welding Society. B3.0-41T Standard Qualification Procedure. 01.0-46 Standard Code for Arc and Gas Welding in Building Construction. 1521,18 Engineering Standards of the Heating, Piping and Air Conditioning Contractors National Association. 1950 Heat Loss Calculations, 1948 Radiation Loads for Low Pressure Heating Boilers, 1945 Pipe. Sizes and Design. 1949 Comfort Air Conditioning. 1950 Graphical Symbols for Use on Drawings. June 1950 Net Load Recommendations for Heating Boilers. 1521.19 Publications of the Institute of Boiler and Idadiator I4lanufacturers. May 1949 I-B-R Installation Guide #2-One Pipe Steam-Heating Systems. May 1949 I-B-R Installation Guide #3-Selection and Installation of Indirect Water Heaters. ` May 1949 I-B-R Installation Guide #5-Baseboard Heating Systems. Aug, 1951 I-B-R Installation Guide #6-Panel Heating for Small Structures. May 1947 I=B-R Installation Guide #100-One Pipe Forced Circulation Hot Water Heating Systems. Mar. 1951 I-B-R Ratings for Cast Iran Boilers. July 1950 I-B-R Testing and Rating Code for Baseboard type of Radiation. May 1947 I-B-R Testing and Rating Code for Low Pressure Cast-Iron Heat- ing Boilers.. 1521.20 Standards of the National Board of Fire Underwriters. 30-1952 Containers for Storing and Handling Flammable Liquids. 31-1951 Installation of Oil Burning Equipments, 51-1950 Gas Systems for Welding and Cutting. 54-1950 Installation of Gas Piping and Gas Appliances in Buildings.. 80-1939 Protection of Openings in Walls and Partitions. 82-1938 .Incinerators. 90-1950 Air Conditioning, Warm Air Heating;~Air Cooling and Ventilating Am.8/50 Systems. 310-1937 Small Heating and Cooking Appliances .(Kerosene and Fuel Oil). Jan. 1949 Building Code Standards for the Installation of Heat Producing Ap- pliances, Ventilating, Air Conditioning, Blower and Exhaust Sys- tems. ]:521.21 National Fire Protection Association. _ NFPA No. 58 Storage and Handling of Liquid Petroleum Gases. May 1951 1521.22 Standards of the National Lumber 16lanufacturers .Association. 1944. National Design Specification for Stress-Grade Lumber and Its R1950 - Fastenings, r: n 93 Heating Appliances and Systems § 1591.42 1591.38 Setting and assembling warm air furnaces. (a) Sealed joint between base ring and foundation. The base ring of every warm air furnace, not constructed with sealed air passages within the assembly, shall be set so as to provide an airtight joint between the base ring and the foundation. Cement mor- tar or other .sealing material shall be used to seal all open spaces or crevices. (b) Airtight assembly, Furnace parts shall be assembled with all parts properly fitted together and with bolts drawn up, so as to provide an airtight assembly. Joints requiring furnace cement shall be well filled with such cement. 1591.39 Casings for warm air furnaces. (a) Casing tops or bonnets required. All warm air furnaces shall be enclosed in metal casings complete with casing tops or bonnets in accordance with requirements of this sec- tion. ' (b) Materials for casings. Metal casings and casing tops or bonnets shall be of gal- vanized iron not less than No. 26 U. S. gage or of equivalent noncombustible material. Casings shall fit the castings and casing rings so as to be dust-tight when assembled, and shall be securely fastened to the front. Cas- ing interliners shall be provided on all gravity warm air furnaces and, when in- stalled in coal-fired furnaces, shall extend from the upper casing ring down to the level of the grate. Casing interliners shall be of metal not less than No, 30 U. S. gage, except that the inner casing of a pipeless furnace connected to a grating used for both warm air and return air shall be not less than 26 U. S. gage. (c) Size. When side collars are used, the casing top or bonnet shall be of sufficient height so that the largest warm air pipe or duct can be taken from the side of the collar without change in shape. The minimum ds- tance from the top of the heater withiri-the casing and the undersurface of the casing top or bonnet shall be 8 inches. (d) Side casing collars. For gravity warm air systems, side casing collars shall be lo- cated so that the tops of all warm air open- ings are on the same level. Casing collars shall be attached to the casings with a flange or bead or other device which will provide a dust-tight joint when drawn up, and all such connections shall be dust-tight. (e) Return air inlet. For gravity warm air systems, the-area-of the return air inlet on the furnace shall be not less than 10 per cent greater than the aggregate area of the warm air openings. 1591.40 Insulation of casing tops or bonnets. All metal casing tops or bonnets which are within 18 inches of unprotected combustible floor construction, or within 12 inches of combustible floor construction protected as described in Section 1591.32, shall be in- sulated on the upper surface by means of an air space within the assembly or shall be covered with not less than 2 inches of mag- nesia, asbestos-cement, sand, or other non- combustible insulating material. 1591.41 Existing chimneys, flues and gas vents. No existing chimney, flue or gas vent shall be connected to a furnace which replaces an existing furnace and which is materially dif- ferent in size of grate or Btu input or in type of fuel used from that replaced, or to a fur- nace which has been converted to burning fuel other than that previously burned in such furnace, or to a furnace where no fur- nace had previously been installed, until the chimney, flue, or vent has been approved by the Building Official, and until such chim- ney, flue, or vent has been cleaned and any repairs required by the Building Official have been made. 1591.42 Relationship between warm air supply and furnace capacity. (a) Based upon areas. Except as provided in subsections (c) and (d) of this Section, the sum of the areas of warm air supply pipes or ducts, and the sum of free areas of regis- ters or grilles connected thereto on gravity warm air systems shall be equal to not less than 70 per cent of the furnace capacity ex- pressed in terms of "Square Inches of Warm Air Pipe Area." (b) Based upon Btuh. Except as provided in subsections (c) and (d) of this Section, the sum of the estimated Btuh flow through the registers of a gravity warm air heating system, calculated on the basis of the follow- ingtable, shall be not less than 70 per cent. of the furnace capacity expressed in terms of "Btu per Hour-Register Capacity": Flow per Register Location.- Square Inch of Story Above Furnace Register Area First Story _________________111 Btuh Second Story _______________167 Btuh Third Story ________________200 Btuh (c) Exception for automatic furnaces. The provisions of subsections (a) and (b)