Gas Fitter Practice Test

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Study for the Gas Fitter Test. Enhance your knowledge with flashcards and multiple-choice questions, each accompanied by hints and explanations. Ace your exam!

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On a 14 /12 pitch roof, what would be the termination height of a 5-inch B-Vent?

4 ft.
5 ft.
6 ft.
10 ft.

The correct answer is: 5 ft.

To determine the appropriate termination height of a 5-inch B-Vent on a roof with a 14/12 pitch, understanding the requirements specified by the applicable codes, such as the National Fuel Gas Code (NFPA 54 or ANSI Z223.1), is essential. For a B-Vent termination, the code typically requires that the vent extends at least 5 feet above the lowest point of the roof where it exits. However, the height may also be influenced by factors such as the angle and pitch of the roof. On a 14/12 pitch roof, which is quite steep, the vent must be able to terminate high enough to prevent any possible recirculation of flue gases and to ensure proper drafting of the ventilation system. By considering the vent height specifications in conjunction with the pitch of the roof, a 5-foot termination height is common. This height helps to ensure that the gases are effectively vented above any structure on the roof and promotes safety by minimizing the risk of any hazardous gases affecting the occupants or neighboring structures. Therefore, a termination height of 5 feet for a 5-inch B-Vent on a 14/12 pitch roof is appropriate and follows both safety and code requirements.