1. The gas service line from the street to the gas meter may be made of plastic. The plastic gas service line should be around ...... inches below ground level, but this may vary, depending on your jurisdiction. You should not see the plastic gas service line above the ground's surface. You may see a pipe (a metal riser) coming out of the ground and connecting to the gas meter. You may see a small wire wrapped around the service line that comes out of the ground next to the meter. This is called the tracer wire.

2. Manually operated vent _____________________ shall not be installed except in connectors or chimneys serving solid-fuel-burning appliances.

3. A house heater should be able to maintain a temperature of _____________________°F, measured 3 feet above floors and 2 feet from walls.

4. For mechanical systems, a level working space at least _____________________ inches deep and _____________________ inches wide shall be provided in front of the control side to service an appliance.

5. Domestic clothes dryer transition ducts shall be metal and limited to a single length not to exceed _____________________feet.

6. The following fuels can be used in a warm-air heating system:

7. Maximum length of a gas dryer vent is _____________________ feet, while other dryers have a maximum vent length of 25 feet.

8. B- and L-vents must extend at least _____________________feet above the roof and anything else within 8 feet.

9. Advantages of Warm-Air Heating Systems

10. Draft Types: There are three types of burners relative to the draft. They are:

11. The primary condensate drain for an AC has a minimum slope of _____________________ inch.

12. Stud wall cavities and the space between floor joists can be used as plenums, under several conditions: These spaces can not be used for supply air. These spaces must not be part of a fire-resistance assembly. These spaces must not convey air from more than one floor level of a house. These spaces must be isolated from adjacent concealed spaces with fireblocking. These spaces in the outside walls of a house must not be used as air plenums.

13. Gravity warm-air furnaces can have efficiencies that are

14. return air from a garage

15. There are two common types of perimeter duct systems: perimeter loop and perimeter radial. Describe them.

16. Controls the operation of the furnace. The thermostat senses the air temperature in the room or space that is being heated. It sends signals to open and close the main gas valve.

17. Above-ground ducts can be made out of a variety of materials, including: plain steel; galvanized sheet metal; aluminum; typically installed outside of building copper;typically installed outside of building fiberglass; paper fiber; are installed in concrete. vitrified clay tile.are installed in concrete. Underground ducts are made of approved concrete, clay, metal or plastic.

18. Gas vents over 12 inches in size shall terminate not less than ____________________ feet above the highest point where they pass through the roof.

19. There should be no screens on the combustible air intake pipe in an _____________________.

20. The maximum duct temperature for plastic ducts is ...... Metal ducts should be protected from corrosion.

21. All Air from Outdoors: If all combustion air is taken from the outdoor air, then one opening should be within 12 inches of the top and one within 12 inches of the bottom of the space. The openings are permitted to connect to spaces directly communicating with the outdoor air, such as a ventilated crawlspace or ventilated attic space. Each opening should have a free area of at least 1 square inch per 4,000 BTU per hour of total input rating of all appliances in the space when using ......ducts, or 2,000 BTU per hour if using .......ducts.

22. When mechanical equipment is located in attics, it shall not be further than _____________________feet from the attic access.

23. Under-floor plenums shall be _____________________ in new structures.

24. Metal HVAC duct should be supported every _____________________ feet.

25. Outdoor and return air for a forced-air heating or cooling system shall not be taken from _____________________.