Gas Fitter Practice · Question
Which type of gas appliance requires outdoor air for combustion and vents combustion products directly to the outdoors, without being affected by indoor air pressure?
Category IV appliances are condensing furnaces that are sealed combustion and typically induce draft, drawing combustion air from outdoors and exhausting flue g
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Question: Which type of gas appliance requires outdoor air for combustion and vents combustion products directly to the outdoors, without being affected by indoor air pressure?
Answer options:
- Category I
- Category II
- Category III ✅ Category IV
Correct answer: Category IV
Explanation: Category IV appliances are condensing furnaces that are sealed combustion and typically induce draft, drawing combustion air from outdoors and exhausting flue gases directly outside.
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- What is the maximum allowed pressure for a propane system supplying a residential appliance?
- When installing a gas outdoor appliance, what is the minimum required clearance from an opening into a buildin
- Which code specifies the requirements for the installation of propane-burning appliances and equipment?
- What is the maximum allowed pressure drop for gas piping within a building, from the point of delivery to the
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