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NFPA 86-2019

NFPA 86 Standard for Ovens and Furnaces, 2019 edition

This standard shall apply to Class A, Class B, Class C, and Class D ovens, dryers, and furnaces; thermal oxidizers; and any other heated systems and related equipment used for processing of materials. The terms ovens, dryers, and furnaces are used interchangeably and shall also apply to other heated enclosures used for processing of materials. Within the scope of this standard, a Class A, Class B, or Class C oven is any heated enclosure operating at approximately atmospheric pressure and used for commercial and industrial processing of materials. A Class A oven shall be permitted to utilize a low-oxygen atmosphere. This standard shall apply to bakery ovens and Class A ovens, in all respects, and where reference is made to ANSI Z50.1, Bakery Equipment — Safety Requirements, those requirements shall apply to bakery oven construction and safety. This standard shall apply to atmosphere generators and atmosphere supply systems serving Class C furnaces and to furnaces with integral quench tanks or molten salt baths. This standard shall apply to Class D ovens and furnaces operating above ambient temperatures to over 5000°F (2760°C) and at pressures normally below atmospheric to 10-8 torr (1.33 × 10-6 Pa).

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National Fire Protection Association [NFPA]


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As the voice of the U.S. standards and conformity assessment system, the American National Standards Institute (ANSI) empowers its members and constituents to strengthen the U.S. marketplace position in the global economy while helping to assure the safety and health of consumers and the protection of the environment.

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