Gas Fitter Practice · Question
Which category of venting system operates under a positive vent static pressure and requires a condensing heat exchanger?
Category IV appliances are high-efficiency condensing units that operate with positive pressure and produce condensate.
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Question: Which category of venting system operates under a positive vent static pressure and requires a condensing heat exchanger?
Answer options:
- Category I
- Category II
- Category III ✅ Category IV
Correct answer: Category IV
Explanation: Category IV appliances are high-efficiency condensing units that operate with positive pressure and produce condensate.
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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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