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

2. Openings must be located more than 10 feet measured in any direction from an open combustion chamber or draft hood of another appliance located in the same room or space. - The amount of return air taken from any room or space must not exceed the flow rate of supply air delivered to that room or space. - Return air must not be taken from a closet, bathroom, toilet room, kitchen, garage, mechanical room, boiler room, furnace room, or unconditioned attic.

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

4. For mechanical system installations in flood hazard areas, _____________________ _____________________ openings shall be located at or above the required elevation.

5. A heater located in a closet must have two 3' pipes at _____________________ inches from top and bottom of closet, with a vent at least 1 square foot.

6. For the national exam, do not run the AC if the outside temperature is below (and do not use the heater is the outside temperature is above) _____________________°F

7. The most common gas piping material is ....... Copper, brass and stainless steel tubing are also used. If the gas piping is copper, then it should be of Type K, L or GP. Underground piping is usually Type K.

8. A device that senses heat. It's used in gas furnaces having a standing-pilot light. It determines whether the pilot flame is lit before the main gas valve is opened to supply gas to the burners. The flame must be lit before the valve is opened. The heat of the pilot flame is converted to electricity by the thermocouple. It turns heat into an electrical current. The current is strong enough to open the main gas valve. After being opened, the gas flows to the pilot light. If the thermocouple does not detect a pilot flame, it will turn off the gas supply to the pilot. The electrical current from a 24-volt AC transformer operates the main gas valve.

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

10. The AC primary condensate drain line should be at least _____________________ inches in diameter, with a 1/8 inch slope.

11. For gas appliance installations using the two-permanent-openings method for combustible air from the outdoors, one opening shall be within _____________________ inches of the top and one within _____________________inches of the bottom of the space.

12. Sauna heaters shall be equipped with a thermostat that will limit room temperature to not greater than _____________________degrees F.

13. The maximum discharge temperature for ducts of a warm-air heating system is ....

14. Service receptacles for HVAC equipment must be within _____________________ feet of inside and outside units.

15. Difference between a perimeter & a plenum duct system?

16. 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.

17. 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.

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

19. Flexible ducting requires _____________________ inch strapping every 4 feet.

20. return air from a garage

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

22. Mechanical appliances having an ignition source shall be elevated such that the source of ignition is not less than _____________________above the floor in garages.

23. 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.

24. DUCTS: What is the most insignificant duct problem found in home inspections?

25. Equipped with a naturally aspirating gas burner and a pilot light. The pilot light is unlike a standing-pilot. It does not run continuously. The pilot light is shut off when the furnace is not in operation -- when the thermostat is not calling for heat. The heat exchanger is more efficient than one inside a conventional furnace. There's no draft hood. There may be a small fan installed in the flue pipe to create an induced draft, so these furnaces are sometimes referred to as induced-draft furnaces. A mid-efficiency gas furnace is also equipped with automatic controls, blower and motor assembly, venting, and air filtering. Some mid-efficiency furnaces have a motorized damper installed in the exhaust flue pipe. A mid-efficiency furnace is about 20% more energy-efficient than a conventional gas furnace. A mid-efficiency furnace has an AFUE rating of 78 to 82%. The intermittent-pilot is the main distinguishing characteristic.