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§ 1529.11 DWELLING HOUSE CODE' 38 soil and other organic matter shall be re- moved and such space shall be graded and drained, (b) Ventilation when adjacent, to base- ment. No foundation wall vents will be re- quired for ventilating a basementless space one side of which, exclusive of structural support, is open to a ventilated basement or cellar, provided the total area of ventilated openings in exterior walls of the basement or cellar is at least two per cent of the com- binedarea of the basement and basementless space. (c) Ventilation when not adjacent to a basement. When the floor construction above a basementless space is of wood, metal, or other material subject to corrosion or de- terioration and the space is not open to a ventilated basement as described in para- graph (b) of this section, at least four foun- dation wall vents shall be provided, located near the corners of the basementless space, having an aggregate free ventilating area equal to two square feet per one hundred lineal feet of wall enclosing the space plus 0,5 per cent of the ground area of the base- mentless space. (d} Protection of vent opening. Each vent opening shall be protected with corrosion- resistant screening, having a mesh of not less than 8 per inch, or its equivalent. 1529.11 Attic ventilation. (a) Required cross ventilation. Fixed cross ventilation shall be provided for all spaces between roofs and top-floor ceilings by means acceptable to the Building Official. All ventilation openings shall be covered with corrosion-resistant fly screening or its equivalent. (b) Ventilation under roof slopes of 3 or more in 12. Where the roof slope is 3 or more in 12 and there is no vapor barrier in the top-story ceiling, ventilation shall be pro- vided in all areas under the roof. The total required ventilation area shall be not less than 1/300 of the horizontal projection of the roof and shall be located at the highest practicable point. (c) Ventilation under roof slopes less than 3 in 12. Where the roof slope is less than 3 in 12 and there is no vapor barrier in the top- story ceiling, the required ventilation area shall be 1/150 of the horizontal projection of the roof. (d) Reduction of required areas. Where a vapor barrier is installed in the top-story ceiling, the ventilation area, required in paragraphs (b) and (c) of this section, may be reduced 50 per cent. CHAPTER 31. ARTIFICIAL LIGHT AND MECHANICAL VENTILATION. 1531.01 Requirements. Where natural.light and ventilation in an occupiable room or space is not provided as required in Chapter 29, artificial light and mechanical ventilation may be substituted provided the minimum requirements listed in TAHLE 31A are met. ~ ~ TAHLE 31A. MINIMUM REQUIREMENTS Type of Raom Artificial Light Mechanical Ventilation Bathrooms __________ _5 ft-candles on floor area at plumbing fixtures. 25 cfm of air to be removed.. Lavatories containing 5 ft-candles on floor area Water Closets _____ _at plumbing fixtures. 20 cfm of air to be removed. Kitchens _.__________._ _Natural light required. 90 cfm of air to be removed. Stairs ______________ _1 ft-candle on tread surfaces. 2 air changes per hour. All other habitable rooms ____________ _Natural light required. 2 air changes per hour. 1531.02 -Allowance for n atural ventilation. 1531.03 Recirculation. Where a part of the ventilation is provided Outside air shall be supplied in quantities by natural means, the mechanical ventilation requirements for acceptable to the Building Official as neces- ~ • may be decreased sary to provide air free-from objectionable proportionately, odors or excessive quantities of carbon di- 87 Heating Appliances and Systems be not less than the calculated heat loss of the building plus 10 per cent. 3. The net output of boilers shall be not less than the calculated heat loss of the build- ing plus all other imposed loads. 1591.06 Heat loss calculations. (a) Method. The maximum hourly heat loss for each heated space shall be calculated by any method, provided the results obtained are in substantial agreement with those ob- tained by using the method prescribed in the ASHVE Heating, Ventilating, Air Condition- ing Guide, or the Heat Loss Calculations of the HP&ACCNA. (b) Transmission coefficients. Transmis- sion coefficients used in the calculation shall be those listed in the ASHVE Guide or as established by tests acceptable to the Build- ing Official. (c) Concrete slabs on ground, Heat losses through concrete floor slabs on the ground shall be calculated in accordance with the perimeter method prescribed in the National Bureau of Standards Report BMS103 or in accordance with an approved equivalent method. 1591.07 Approved standards for equipment. (a} General. All heating equipment in- stalled after the effective date of this Dwell- ing House Code shall be in conformity with the provisions of this Dwelling House Code and in conformity with accepted safe prac- tice. (b) Accepted standards for equipment. Except as otherwise provided in this Dwell- ing House Code or in statutes or in rules or regulations promulgated by authority of statute or in other ordinances, compliance of equipment with the applicable require- ments of the following Standards shall be accepted as conformity. with accepted safe practice, provided, however, that the Board of Building Code Appeals may change, modify, or supplement any of the require- ments of such Standards when deemed necessary in the interest of public safety or to further define accepted safe practice: 1. Oil burning space heaters. Flue-con- nected, oil-burning space heaters equipped with vaporizing pat-type burners, CS101. 2. Oil burning floor f urnaces. Oil-burning floor furnaces equipped with vaporizing pot- type burners, CS113, 3. Oil and solid f uel burning warm air f ur- naces: Warm-air furnaces equipped -with vaporizing-type oil burners,. CS104. § 1591.07 Solid fuel-burning forced air furnaces, CS 109. Air conditioning, warm air heating, -air cooling and ventilating systems, NBFU Pamphlet No. 90. 4. Steam and hot water boilers. Except as otherwise provided in this Dwelling House Code, or in statutes, or in rules or regulations promulgated by authority of statute, or in other ordinances, or in Standards listed in this Section, steam and hot water heating boilers shall conform to the Low Pressure Heating Boiler Code of the American So- ciety of Mechanical Engineers. 5. Miscellaneous oil burning equipment. Standards of the National Board of Fire Underwriters for the Installation of Oil Burning Equipment, NBFU Pamphlet No. 31. Regulations of the National Board of Fire Underwriters for the Installation, Mainte- nance and Use of Small Heating and Cooking Appliances. (Kerosene and Fuel Oil)- NBFU Pamphlet No. 310. Automatic Mechanical Draft Oil Burners Designed for Domestic Installations-Com- mercial Standards CS75. 6. Gas-fired devices, appliances and ac- cessories. 6a. Listing, Approval and Installation Re- quirements for Gas-Burning Appliances and Accessories, as approved by the American Standards Association, as follows: Approval Requirements for Clothes Dry- ers-ASA 221.5. Approval Requirements for Incinerators- ASA 221,6. Requirements for Installation of Conver- sion Burners in House Heating and Water Heating Appliances-ASA 221.8, Approval Requirements for Hot 'Plates and Laundry Stoves-ASA 221.9, Z21.9a. Approval Requirements for Gas Water Heaters-ASA 221.10. Approval Requirements for Gas-Fired Room Heaters-ASA 221.11. Listing Requirements for Draft Hoods= ASA 221.12. Approval Requirements for Central Heat- ing Gas Appliances-ASA 221.13. Listing Requirements for Gas Valves- ASA 221.15. Approval Requirements for Gas Unit Heaters-ASA 221.16. Listing Requirements for Gas Conversion Burners-ASA 221.17. Listing Requirements for Domestic Gas Appliance Pressure Regulators=ASA-Z21.- 18: