Gas Fitter Practice · Question
Which of the following describes the properties of Type B vent material?
Type B vent is a factory-built, double-wall metal pipe used for venting Category I gas-fired appliances equipped with a draft hood.
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Question: Which of the following describes the properties of Type B vent material?
Answer options:
- Single-wall, for unlisted appliances ✅ Double-wall, for gas appliances with draft hoods
- Single-wall, for high-temperature applications
- Double-wall, for condensing appliances only
Correct answer: Double-wall, for gas appliances with draft hoods
Explanation: Type B vent is a factory-built, double-wall metal pipe used for venting Category I gas-fired appliances equipped with a draft hood.
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