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§ 1591.44 DWELLING HOUSE CODE 96 (q) Passing through combustible walls or partitions. Where warm air supply pipes or ducts pass through a wall or partition of com- bustible construction, they shall be installed as specified in subsection (p) of this Section. A metal thimble may be used to provide the double wall if the space between the pipe or duct and the thimble is not less than 1 inch. This space may be filled with noncombus- tible material or closed with metal collars. (r) Uniform pitch upward from furnace. On gravity warm air heating systems, all warm air supply pipes and ducts shall have a uniform upward pitch from the furnace of not less than 1/16 inch per running foot. 1591.44 Return air pipes or ducts on warm air heating systems.. (a) Materials. Except as provided by sub- section (b) of this Section, return air pipes or ducts shall be constructed of metal, or of nominal l inch wood boards, or other equiv- alent material, provided that no material more flammable than 1 inch wood boards shall be used. (b) Construction near furnace. Portions of such return air pipes or ducts closer than 6 feet from any heated surface of a furnace shall be constructed as required for warm air supply pipes or ducts. (c) Using spaces between studs or joists. Where spaces between studs in walls or partitions, or spaces between joists in floors, are used as return air ducts, the portions of such spaces so used shall be cut off from all remaining unused portions by tight fitting stops of sheet metal, or of wood not less than 2 inches thick. (d) Noncombustible lining. The interior of combustible return air ducts shall be lined with noncombustible material at points where it is determined by the Building Offi- cial that there might be danger from incan- descent particles dropped through the regis- ter or heater, including, but not limited to, directly under floor registers and at the bot- tom of vertical ducts, or directly under heaters having a bottom return. (e) Ope~aings in vertical stacks. No ver- tical stack shall have openings to receive re- turn air on more than one floor. (f) Open-ended return air drops. Return air may be conducted to the furnace through open-ended return air drops terminated close to the floor level of the space within which the furnace is installed, utilizing such space as a plenum for return air, and except that underfloor spaces may be used as ducts for return of air from rooms directly above when such underfloor spaces are not over 2 feet in height to the bottom of floor. joists and are cleaned of all combustible material and are tightly and firmly enclosed. (g) Return air ducts in a gravity system. In gravity warm air heating systems, the top of the return air openings in the furnace casing shall be not higher than the level of the combustion zone within the furnace un- less the return air openings are shielded in a manner approved by the Building Official against heat radiated from the furnace. In gravity warm air heating systems, all return air shall be conducted toward the furnace or plenum in which the furnace is installed, by gravity flow and no reverse inclines or trapped returns shall be permitted. (h) Return air drops in a f orced warm air system. Where open-ended return air drops are used in connection with forced warm air heating systems, the volume of the space in which such return air drops are terminated shall be not less than twice the cfm capacity of the fan, and the air intake into the system from such space shall be remote from any draft-hood, barometric damper, or check draft; or similar opening to a flue, installed in such space, and shall be located so that the, air stream to such intake shall not pass over such device or opening. 1591.45 Register boxes on gravity warm air heating systems. (a) Existing narrow throat register boxes. Whenever a new furnace is installed or an existing furnace is replaced in gravity warm , air heating systems, any existing narrow throat register boxes located less than one full story height above the top of the furnace shall be removed and replaced with wide throat register,boxes. (b) Narrow throat register boxes in new installations. In new gravity warm air heat- ing installations, narrow throat register boxes shall not be used less than one full story height above the level of the top of the furnace. (c) Registers in combustible construction. Where registers are placed in floors or walls of combustible construction, the register shall be covered with 12-1b. asbestos paper and a clear space of not less than 5/16 inch shall be left between the sides of the regis- ter box and any combustible material. 1591.46 Required air supply to warm air heating systems. Whenever a new warm air furnace is in- stalled or an existing warm air furnace is 29 National Standards § 1521.10 C 55-37 Standard Specifications for Concrete Building Brick. C 56-50 Standard Specifications for Structural Clay Non-Load-Bearing Tile, C 61-50 Standard Specifications for Keene's Cement. C 62-50 Standard Specifications for Building Brick (Solid Masonry Units Made from Clay or Shale) . C" 73-51 Standard Specifications for Sand-Lime Building Brick. C 90-44 Standard Specifications for Hollow Load-Bearing Concrete Masonry Units. C 91-51 Standard Specifications for Masonry Cement. C 126-50T Tentative Specifications for Ceramic Glazed Structural Clay Facing Tile, Facing Brick, and Solid Masonry Units. C 129-39 Standard Specifications for Hollow Non-Load-Bearing Concrete ~ Masonry Units. ; ; C 130-42 Standard Specifications for Lightweight Aggregate for Concrete. C 141-42 Standard Specifications for Hydraulic Hydrated Lime for Struc- tural Purposes. C 144-44 Standard Specifications for Aggregate for Masonry Mortar. C 145-40 Standard Specifications for Solid Load-Bearing Concrete Masonry Units. C 150-49 Standard Specifications for Portland Cement. C 161-44T Tentative Specifications for Mortar for Reinforced Brick Masonry. C 175-51T Tentative Specifications for Air-Entraining Portland Cement. C 192-49 Standard Method of Making and Curing Concrete Compression and Flexure Test Specimens in the Laboratory. ® ~ C 200-50T ~ Tentative Specification for Extra Strength Clay Pipe. C 205-51T Tentative Specifications for Portland Blast-Furnace Slag Cement. C 206-49 Standard Specifications for Special Finishing Hydrated Lime, C 207-49 Standard Specifications for Hydrated Lime for Masonry Purposes. C 212-50T Tentative Specifications for Structural Clay Facing Tile. C 216-50 - Standard Specifications for Facing Brick (Solid Masonry Unit Made of Clay or Shale). ' 1521.09 Standards and tentative standards of ASTM: Prefix "D." D 226-47 'Stand. Specs. for Asphalt-Saturated Roofmg Felt for Use in Water- proofing and Constructing Built-Up Roofs. D 227-47 Standard Specifications for Coal-Tar Saturated Roofing Felt for Use in Waterproofimg and in Construction Built=Up Roofs. - D 245-49T. Tentative Method for Establishing Structural Grades of Lumber. D 250-47 Standard Specifications for Asphalt-Saturated Asbestos Felts for Use in Waterproofing and in Constructing Built-Up Roofs. D 371-51 Standard Specifications for Wide Selvage Asphalt Roofmg Surfaced With Mineral Granules. D 655-47 Standard Specs. for Asphalt-Saturated and Coated Asbestos Felts ,for Use in Constructing Built-Up Roofs. 1521.10 Standards and tentative standards of ASTM: Prefix "E." E 72-51T Tentative Methods of Conducting Strength Tests of Panels for ' Building Construction. E 84-50T Tentative Method of Fire Hazard Classification of Building Mate- rials. E 119-50 Standard Methods of Fire Tests of Building Construction and Mate- . vials. bli ~ S d f 1V d r h E.152-41 . Door Assem es. tan ard . s of Fi e Tests: o let o