What is the minimum B-vent clearance to combustibles?

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Prepare for the NFPA 54 National Fuel Gas Code Test. Enhance your knowledge with multiple-choice questions and flashcards, complete with hints and detailed explanations. Get exam-ready now!

Multiple Choice

What is the minimum B-vent clearance to combustibles?

Explanation:
B-vent is a listed factory-built vent for certain gas appliances, designed with insulation and a protective jacket that lets it run cooler on the outside. Because of that, the code allows it to be installed as close as one inch to combustibles, which is the minimum clearance. This small gap reduces heat transfer risk while keeping installation practical; larger clearances aren’t required as the standard minimum, though you must follow any manufacturer-specified clearances for a given installation.

B-vent is a listed factory-built vent for certain gas appliances, designed with insulation and a protective jacket that lets it run cooler on the outside. Because of that, the code allows it to be installed as close as one inch to combustibles, which is the minimum clearance. This small gap reduces heat transfer risk while keeping installation practical; larger clearances aren’t required as the standard minimum, though you must follow any manufacturer-specified clearances for a given installation.

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