Air Supply & Venting Flashcards
What causes the pull or motive force in an atmospheric venting system?
The difference in temperature inside and outside the flue
What is the name given to the gases in the appliance after combustion?
The products of combustion
What is the reason that almost all gas appliances are fitted with a vent?
Without it, the building could be damaged
Air introduced into the gases leaving the combustion chamber prior to their entry into the vent is:
The dilution air
What are the main problems connected with venting?
The condensation formed and spillage at the draft Hood
When excess air is added to the products of combustion, the result is:
Flue gases
An atmospheric burner requires____draft for proper operation:
Neutral over-fire
Condensation is formed in a flu due to what?
A drop in temperature
How much dilution air is required for venting gas appliances?
100% of the flue gases
The temperature at which condensation is formed is called:
The dew point
What is the average flue gas temperature at the inlet of the draft Hood?
520° f
For every 1000 BTUs of heat value in natural gas, how many cubic feet of air are required for complete combustion?
10 cubic feet
The typical temperature drop across the draft Hood of a gas appliances is approaching:
150°f
What temperature does condensate usually form in the vent gases of a gas appliance?
125°f
Ducts that bring the ventilation air into buildings shall have:
Noncombustible materials used in their construction
