|
1521.05 DWELLING HOUSE CODE 28
<br />1521,05 Handbook of the American Society of Heating and Ventilating Engineers,
<br />1952 Heating Ventilating Air Conditioning Guide.
<br />1521.06 Standards and tentative standards of the American Society for Testing 1Q4aterials;
<br />Prefix "A."
<br />A 7-50T Tentative Specifications for Steel for Bridges and Buildings.
<br />A 44-41 Standard Specifications for Cast Iron Pit-Cast Pipe for Water and
<br /> Other Liquids.
<br />A 48-48 Standard Specifications for Gray Iron Castings.
<br />A 72-45 Standard Specifications for Welded Wrought Iron Pipe,
<br />A 74-42 Standard Specifications for Cast Iron Soil Pipe and Fittings.
<br />A 93-5DT Tentative Specifications for Zinc-Coated (Galv.) Iron and Steel
<br /> Sheets.
<br />A 120-47 Standard Specifications for Black and Hot-Dipped Zinc-Coated
<br /> (Galv.) Welded and Seamless Steel Pipe for Ordinary Uses,
<br />A 141-50T Tentative Specifications for Structural Rivet Steel.
<br />A 163-39 Standard Specifications for Zinc-Coated (Galv.) Wrought Iron
<br /> Sheets,
<br />A 233-48T Tent. Specs. for Iran and Steel Arc-Welding Electrodes,
<br />A 245-48T Tentative Specifications for Heavy Gage Structural Quality Flat
<br /> Hot-Rolled Carbon-Steel Sheets.
<br />A 246-48T Tentative Specifications for Light Gage Structural Quality Flat
<br /> Rolled Carbon-Steel Sheets.
<br />A 251-46T Tent. Specs, for Iron and Steel Gas-Welding Rods,
<br />A 253-51T1 Stand. Specs. for Welded and Seamless Open-Hearth Iron Pipe.
<br />A 303-48T Tentative Specifications for Hot-Rolled Carbon-Steel Strip of Struc-
<br /> tural Quality. .
<br />1521.07 Standards and tentative standards of ASTNI: Prefix "13."
<br />B 29-49 Standard Specifications for Pig Lead.
<br />B 32=49 Standard Specifications for Soft Solder Metal,
<br />B 36-51T Tent. Specs. for Brass Plate, Sheet, Strip, and Rolled Bar.
<br />B 43-51 Standard Specifications for Seamless Red Brass Pipe, Standard
<br /> Sizes.
<br />B 75-51T Tentative Specifications for Seamless Copper Tubes.
<br />B 88-51 Standard Specifications for Seamless Copper Water Tubes.
<br />B 121-51T Tent, Specs. for Leaded Brass Plate, Sheet, Strip, and Rolled Bar.
<br />B 135-51T Tentative Specifications for Seamless Brass Tubes.
<br />B 152-51T ,Tent. Specs. for Copper Sheet, Strip, Plate, Rolled Bar.
<br />1521.08 Standards and tentative standards of AST)dI: Prefix "C:'
<br />C 5-26 Standard Specifications for Quicklime for Structural Purposes.
<br />C 6-49 Standard Specifications for Normal Finishing Hydrated Lime,
<br />C 10-49T Tentative Specifications for Natural Cement.
<br />C 13-50T Tentative Specifications for Standard Strength Clay Sewer Pipe.
<br />C 14-41 Standard Specifications for Concrete Sewer Pipe.
<br />C 22-50 Standard Specifications for Gypsum.
<br />C 28-50 Standard Specifications for Gypsum Plasters.
<br />C 33-49 Standard Specifications for Concrete Aggregates,
<br />C 34-50 Standard Specifications for Structural Clay Load-Bearing Wall Tile.
<br />C 35-39 Standard Specifications for Sand for Use in Plaster.
<br />C 39-49 Standard Method of Test for Compressive Strength of Molded Con-
<br /> crete Cylinders.
<br />C 52-41 Standard Specifications for Gypsum Partition Tile or Block.
<br />
<br />
<br />
<br />
<br />
<br />
<br />97
<br />Heating Appliances and Systems
<br />replaced and whenever a gravity warm air
<br />heating system is converted to a forced warm
<br />air heating system, return air supplies of
<br />such warm air heating systems shall con-
<br />form to the following requirements:
<br />i. Except as permitted under subsection
<br />(v) of this Section, the aggregate net area
<br />of continuous return air pipes or ducts in
<br />gravity warm air heating systems, shall be
<br />not less than 110 per cent of the aggregate
<br />net area of the warm air supply pipes or
<br />ducts leading from the furnace; and net
<br />area of return air drops, terminating open-
<br />ended in a plenum space in which the fur-
<br />nace is installed, shall be not less than 70
<br />per cent of the aggregate net area of the
<br />warm air supply ducts.
<br />ii. Except as permitted under (v) of this
<br />Section, the aggregate net area of continuous
<br />return air pipes or ducts in forced warm air
<br />heating systems, shall be not less than the
<br />aggregate net area of the warm air supply
<br />ducts or pipes leading from the furnace; and
<br />the aggregate net area of return air drops
<br />shall be not less than one square inch for
<br />each 200 Btu of rated heat input capacity of
<br />the furnace, or, where furnaces are not rated'
<br />by heat input, shall be not less than 1 square
<br />inch for each 130 Btu heat loss of the build-
<br />ing.
<br />iii, Return air shall be returned to the
<br />furnace either through continuous ducts or
<br />through open-ended return air drops, but in
<br />any one installation return air shall not be
<br />returned through both.
<br />iv. Return air pipes or ducts with open
<br />ends in the space where the furnace is lo-
<br />cated shall extend to within 12 inches of the
<br />floor of such space. Where such open-ended
<br />return air pipes or ducts are used in con-
<br />nection with forced warm air systems, they
<br />shall be plainly marked: "For Your Own
<br />Safety Do Not Obstruct," with arrows point-
<br />ing toward open ends of such pipes or ducts.
<br />v. Whenever the installation of additional
<br />return air pipes or ducts in an existing
<br />dwelling is deemed to be impracticable by
<br />the Building Official or would, in the opinion
<br />of the Building Official, result in undue hard-
<br />ship, and provisions are made to supplement
<br />the return air from return air pipes or ducts
<br />with additional air from other uncontami-
<br />nated sources, the Building Official may ap-
<br />prove lesser areas than those specified in (i)
<br />and (ii) of this Section provided that the air
<br />supplied to the furnace will include the
<br />maximum that can be returned by return air
<br />- pipes or ducts and the aggregate quantity of
<br />air supplied to the furnace will be adequate
<br />§ 1591.49
<br />for efficient operation of the warm air supply
<br />system.
<br />1591.47 Warm air heating panels.
<br />Air chambers having one or more external
<br />su~~faces designed for use as heating panels
<br />shall conform to the following:
<br />i. Such chambers shall be used only with
<br />systems equipped with approved controls
<br />which will effectively prevent the tempera-
<br />ture of the air in the main supply duct from
<br />exceeding 150 F.
<br />ii. Such chambers shall be enclosed on all
<br />sides with material which is wholly non-
<br />combustible or which is classified as "fire-
<br />retardant" under the provisions of Federal
<br />Specification SS-A-118a. Such enclosing
<br />material shall be securely attached to the
<br />building structure, and joints and seams
<br />shall be substantially air-tight. Braces and
<br />hangers inside the chamber shall be non-
<br />combustible. Interior linings, if used, shall
<br />befire-resistive.
<br />1591.48 Air filters for warm air heating
<br />systems.
<br />(a) Type required. Air filters shall be of
<br />a type that will not burn freely or emit large
<br />volumes of smoke or other objectionable
<br />products of combustion, when burning. Any
<br />liquid adhesive coating used on filters shall
<br />have a flash point of 350 F or higher, using
<br />Cleveland open cup tester.
<br />(b) Prohibited on gravity systems. Air
<br />filters shall not be installed in gravity warm
<br />air heating'systems.
<br />1591.49 Firestopping.
<br />(a) Where removed. Where the installa-
<br />tion of pipes or ducts in walls or partitions
<br />requires the removal of any firestopping, the
<br />space around the pipes or ducts at the points
<br />where firestopping was removed shall be
<br />tightly filled with asbestos, mineral wool, or
<br />other noncombustible insulating material.
<br />(b) Around floor openings. Where pipes,
<br />ducts, stacks, or fittings pass through a floor
<br />construction, all open spaces around them
<br />shall be filled with asbestos, mineral wool, or
<br />other noncombustible insulating material,
<br />(c) Above wall registers in stud framing.
<br />Whenever baseboard or wall ;registers, lo-
<br />cated at the top of supply or return air ducts,
<br />are installed in stud framed walls or parti-
<br />tions, or in construction having concealed
<br />interior spaces, a firestop shall be installed
<br />approximately 3 inches above such register
<br />or grille. In stud framed construction, such
<br />firestops shall extend the full width' and
<br />depth of the stud space.
<br />
|