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• 6201 1997 UNIFORM FIRE CODE 6205.5 ARTICLE 62 — INDUSTRIAL BAKING AND DRYING OVENS ! SECTION 6201 —SCOPE face temperatures from exceeding 160°F(71.1°C).Exhaust ducts shall not discharge near doors,windows or other air intakes in a Location,construction and operalion of industrial baking and dry- manner that wi11 risk reentry of vapors into the buildi��g. ing ovens which are heated with oil or gas fuel or which during operation contain flammable vapors from lhe products being baked or dried shall be in accordance with nrticle(2.This article SECTION 6204—VENTILATION � provides requirements for the operation of these ovens within cer- , � tain limitations of control depending on oven design, paint for- 6204.1 General. Ovens in which tlammable or toxic vapors are . mulation and ventilation requirements. In addition to the liberated or through which products of combustion are circulated ." reyuirements of Article 62, industrial baking and drying ovens shall be ventilated by the introduction of fresh air and proper ' shall comply with UFC Standard 62-1. exhaust to outdoors. Discharge pipes shall not terminate withi❑ 10 feet(3048 mm),measured horizontally,from doors,windows or wood frame walls of buildings. Oven ventilation shall be , i SECTION 6202—PERMITS AND PLANS arranged to provide vigorous and well-distributed air circulation For a permit to operate an oven regulated by Article 62,see Sec- �'�thin the oven and to ensure that the flammable vapor tion 105,Permit o.3.Application for a permit shall be accompa- concentration will be below the lower explosive limit at all times. nied by plans showing essential details and calculations Unless the oven is operated in accordance with specific approval demonstrating safe operation. specifying particular solvents and rate of ventilation, the rate of ventilation shall not be less than 10,00U cubic feet of fresh air per gallon of solvent evaporated (74.8 m�/L) in continuous process SECTION 6203—LOCATION AND CONSTRUCTION ovens and not less Ihan 380 cubic feet per minute per gallon(0.047 6203.1 (:.eneral. When Icic�ting ovens,civen he�ters and relaled mjls per L) of flammahle solvent evaporated in batch process equipment, the possihility of fire resulting from overheating or �vcns. from the escape of fuel gas or fuel oil and the possibility of damage 6204.2 Duct Intake Openings. Exhaust duct intake openings to the building and injury to persons resulting from explosion shall shall be located in the area of greatest concentration of vapors. be considered. " 6204.3 Conveying Means. Exhaust shall be conveyed by me- 6203.2 Elevation. Ovens shall be located at or above grade. chanical means using power-driven fans. �� FXCEPTION: Ovens are allowed in basements having at Icast 50 percen�of Ihe wall area of the room in which the oven is Iocated above grade. SECTION 6205—SAFETY CONTROLS 6203.3 Clearances. Ovens shall be readily acc�essible for in- (�Zp5.1 GeneraL Safety controls specified in UFC Standard spection and maintenance and shall have adeyuate clearances to (�2_�I shall be provided in sufficient number and substantially con- allow the proper functioning of explosion vents. Roofs and Floors structed and arranged to maintain lhe required conditions of safety of ovens shall be sufficicntly insulated and ventilated to kecp �it�d prevent the devclopment of fire and explosion hazards. lemperatures at combustible ceilings ancl floors below 160°P (71.1°C). 6205.2 Ventil�tion Controls. Suitably intedocked ventilation controls shall be provicled which will ensure required ventilation 6203.4 Construction. Ovens with a maximum oven-operating �f the systern. temperature exceeding 160�F (7 L 1°C) shall be constructed of noncombustible materials.The amount of insulation used in oven 6205.3 Tuel-safety Controls. Suitahly in�erlocked fuel-safety panel construction shall be adequate to prevent the outside surface contr<ils shall he provided and arranged to minimize the possibil- temperature fro�ro excecding 1(O�T(71 J°C),c�r adcyuate guards ity of dangerous accumulations<if explosive air-fuel mixtures in shall be provided to protect personnel. the heating system. ! 6203.5 Explosion Control. Ovens which could contain tlam- 6205.4 L+'xcess 1'emperature Controls. Excess temperature -�� mable air-gas mixtures shall be equipped with explosion venting. controls shall be provided to maintain a safe operating temperature within the oven. 6203.6 llucts. Ducts shall be constructed of noncombustible material. Ducts shall be tight and shall not have openings other 6205.5 Conveyor Interlocks. Conveyor interlocks shall he pro- than those required for the proper operation and maintenance of vided in conveyor ovens having a flammable vapor hazard such tite system. Ducts passing through combustible walls, [loors or that the conveyor cannot move unless ventilating flns are operat- roofs shall have adequate insulation and clearances to prevent sur- ing and discharging the required volume of air. �� 1-131