Gas Fitter Practice · Question
A Category III gas appliance operates with a slightly positive vent pressure and typically requires a watertight and corrosion-resistant vent pipe. What is a common material for such a vent?
Category III appliances produce positive vent pressure and operate at lower flue gas temperatures (potentially condensing). Stainless steel like AL29-4C is desi
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Question: A Category III gas appliance operates with a slightly positive vent pressure and typically requires a watertight and corrosion-resistant vent pipe. What is a common material for such a vent?
Answer options:
- Type B double-wall galvanized steel
- Single-wall aluminum
- PVC or CPVC plastic ✅ Stainless steel (e.g., AL29-4C)
Correct answer: Stainless steel (e.g., AL29-4C)
Explanation: Category III appliances produce positive vent pressure and operate at lower flue gas temperatures (potentially condensing). Stainless steel like AL29-4C is designed to resist corrosion and handle these conditions.
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