Gas Heat ESCO Practice Exam

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The vent system for a condensing furnace is classified as ___ by the National Field Gas Code.

  1. Category I

  2. Category II

  3. Category III

  4. Category IV

The correct answer is: Category I

A Category I vent system is used for natural draft appliances, which rely on natural indoor air convection to safely remove products of combustion to the outdoors. Category II, III, and IV vent systems are used for appliances that require mechanical assistance for gas removal, and each successive category has more rigorous installation requirements due to the higher likelihood of corrosive condensates. Therefore, B Category II, C: Category III, and D: Category IV are incorrect options.

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