Combustion and Venting Principles Flashcards
6 cards from real G3 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Combustion and Venting Principles flashcards as text
How does a power venter differ from natural draft?
Answer: Power venters use a motorized fan to move flue gases
A power venter uses an electric fan to mechanically force flue gases through the vent.
What is common venting in multi-appliance installations?
Answer: Multiple appliances share a single vent with specific sizing rules
Common venting allows multiple appliances to share a vent with strict sizing rules.
What vent material is required for high-efficiency condensing furnaces?
Answer: CPVC, PVC, or stainless steel rated for condensate
Condensing furnaces produce acidic condensate requiring corrosion-resistant materials.
What is the purpose of a barometric damper?
Answer: To regulate draft by allowing room air in when draft is excessive
A barometric damper opens to moderate excessive draft by admitting room air.
Why must heat exchangers be checked for cracks during inspection?
Answer: Cracks can allow CO to mix with circulating air
A cracked heat exchanger allows toxic combustion products into the building's air supply.
What is the minimum vent termination height for a natural draft Category I appliance?
Answer: 2 feet above highest point within 10 feet
CSA B149 requires 2 feet above the highest point within 10 feet horizontally.