*“Furnaces” Quiz*
1. What does the furnace in Elbow’s house use for fuel?
It uses natural gas.
2. True or False: natural gas is VERY stinky.
FALSE! It doesn’t smell AT ALL!
3. How does the gas company know how much money to bill us?
The gas meter at the side of the house measures how much gas goes into our
house, so the gas company knows how much we have to pay them.
4. What upstairs device decides when the furnace should turn
on?
The thermostat tells the furnace to turn on.
5. What part makes sure there’s no leftover gas in the
furnace that might explode?
The exhaust blower turns on and blows any leftover gas out of the furnace,
through a pipe and outside the house.
6. What part of the furnace sets the gas on fire?
The hot igniter causes the gas to catch fire.
7. Where does hot gas from the flames turn into hot air for
the house?
Inside the heat exchanger, which is a bunch of metal tubes, the hot gas
from the flames goes through and heats up the metal, which then heats up
the air touching the outside of the tubes.
8. What actually blows the air through the house?
The big blower fan!
9. True or False: the tubes that the hot air goes through are
called “ducks”.
FALSE! The metal tubes are called “ducts”, NOT ducks. They do not quack!!
10. What cleans the air going through the furnace?
The air goes through a FILTER to get rid of dust.
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