Gas Fitter Practice · Question
When is a mechanical draft system typically required for venting gas appliances?
Mechanical draft systems are utilized to overcome venting challenges such as long runs, multiple appliances, or negative building pressures.
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Question: When is a mechanical draft system typically required for venting gas appliances?
Answer options:
- When the appliance is located on the first floor.
- When the vent connector is short and straight. ✅ When adequate natural draft cannot be established or maintained.
- When the appliance input rating is below 40,000 BTU/hr.
Correct answer: When adequate natural draft cannot be established or maintained.
Explanation: Mechanical draft systems are utilized to overcome venting challenges such as long runs, multiple appliances, or negative building pressures.
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