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TREC Home Inspector National Exam: HVAC

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TREC Home Inspector National Exam: HVAC

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25 Questions

1. A Type B-W gas vent shall terminate at least _____________________ feet in vertical height above the bottom of the wall furnace.

2. return air from a garage

3. Mechanical appliances installed in attics shall have a luminaire controlled by a switch located at the required _____________________ _____________________ and a 120 volt receptacle outlet provided at or near the appliance location.

12'HVAC systems that supply air to the living space of a house must not supply air to or ........... A furnace or air handler is prohibited from serving both the garage and living spaces. If a garage is conditioned, it must be by an independent HVAC system. Garage could contain contaminants that would affect the indoor air quality of the living spaces.passageway opening6'

4. Gas appliance shutoff valves shall be located in the same room as the appliance and not further than _____________________ feet from the appliance.

6'passageway opening12'HVAC systems that supply air to the living space of a house must not supply air to or ........... A furnace or air handler is prohibited from serving both the garage and living spaces. If a garage is conditioned, it must be by an independent HVAC system. Garage could contain contaminants that would affect the indoor air quality of the living spaces.

5. Underground fuel gas piping systems shall be installed a minimum depth of _____________________inches below grade.

6. Confined Space and Combustion Air

HVAC systems that supply air to the living space of a house must not supply air to or ........... A furnace or air handler is prohibited from serving both the garage and living spaces. If a garage is conditioned, it must be by an independent HVAC system. Garage could contain contaminants that would affect the indoor air quality of the living spaces.12'If the volume of space where the appliance is located is less than 50 cubic feet of space per......BTU per hour of aggregate input of the appliance, then it is a confined space. - - 50 cubic feet = 2.5 feet x 2.5 feet x 8 feet - - In unconfined spaces in buildings, infiltration may be adequate to provide air for combustion, ventilation and dilution of flue gases. However, in buildings of tight construction -- for example, doors and windows that have weatherstripping, walls that are heavily insulated, openings that are caulked, floors and walls with vapor barriers, etc. -- additional air may need to be provided. - - Solution - - Two permanent openings to adjacent spaces could be provided so that the combined volume of all spaces meets the requirements. If the building is sealed so tightly that infiltration air is not adequate for combustion, combustion air should then be obtained from outdoors. - 1,000passageway opening

7. No AC return air grilles are permitted within _____________________feet of the fireplace.

8. BTU is the abbreviation for _____________________ _____________________ _____________________, which is the quantity of heat required to raise the temperature of 1 pound of water by 1 degree F.

12'passageway openingHVAC systems that supply air to the living space of a house must not supply air to or ........... A furnace or air handler is prohibited from serving both the garage and living spaces. If a garage is conditioned, it must be by an independent HVAC system. Garage could contain contaminants that would affect the indoor air quality of the living spaces.British Thermal Unit

9. The U.S. government has established a minimum rating for furnaces of

passageway opening78%HVAC systems that supply air to the living space of a house must not supply air to or ........... A furnace or air handler is prohibited from serving both the garage and living spaces. If a garage is conditioned, it must be by an independent HVAC system. Garage could contain contaminants that would affect the indoor air quality of the living spaces.12'

10. What are the two major duct categories?

Above and below ground - Above ground more so in cold areas subject to freezing12'passageway openingHVAC systems that supply air to the living space of a house must not supply air to or ........... A furnace or air handler is prohibited from serving both the garage and living spaces. If a garage is conditioned, it must be by an independent HVAC system. Garage could contain contaminants that would affect the indoor air quality of the living spaces.

11. Don't test the house heating if the outside temperature is above _____________________°F.

passageway opening70°FHVAC systems that supply air to the living space of a house must not supply air to or ........... A furnace or air handler is prohibited from serving both the garage and living spaces. If a garage is conditioned, it must be by an independent HVAC system. Garage could contain contaminants that would affect the indoor air quality of the living spaces.12'

12. Where would you most likely find a Perimeter loop warm air heating system ?

passageway openingHVAC systems that supply air to the living space of a house must not supply air to or ........... A furnace or air handler is prohibited from serving both the garage and living spaces. If a garage is conditioned, it must be by an independent HVAC system. Garage could contain contaminants that would affect the indoor air quality of the living spaces.Perimeter-loop warm-air heating systems are typically found in homes built on a concrete slab rather than those having a basement. In this system, round ducts are embedded in the slab.12'

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

14. 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.

15. 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.

12'Return air openings for HVAC systems must comply with the following:passageway openingHVAC systems that supply air to the living space of a house must not supply air to or ........... A furnace or air handler is prohibited from serving both the garage and living spaces. If a garage is conditioned, it must be by an independent HVAC system. Garage could contain contaminants that would affect the indoor air quality of the living spaces.

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

12'250 degree Fpassageway openingHVAC systems that supply air to the living space of a house must not supply air to or ........... A furnace or air handler is prohibited from serving both the garage and living spaces. If a garage is conditioned, it must be by an independent HVAC system. Garage could contain contaminants that would affect the indoor air quality of the living spaces.

17. Louvers: In calculating the free area of a combustion air opening fitted with louvers, the inspector should note that metal louvers obstruct about ........ of the opening, and wooden louvers obstruct ...... of it.

12'metal 25%, wood 75%passageway openingHVAC systems that supply air to the living space of a house must not supply air to or ........... A furnace or air handler is prohibited from serving both the garage and living spaces. If a garage is conditioned, it must be by an independent HVAC system. Garage could contain contaminants that would affect the indoor air quality of the living spaces.

18. The use of gypsum material (drywall) for the construction of a return air duct system or plenum is allowed, provided that the air temperature does not exceed.......... Gypsum board is a composite material commonly used to build air plenums, shafts, and spaces. Air temperatures greater than 125℉ will, over time, dry out the paper facing material on the drywall and will lead to deterioration of the panel. Drywall can also deteriorate when exposed to moisture or condensation. For this reason, drywall must not be used with evaporative cooling equipment (or swamp coolers).

12'passageway opening125 degreeHVAC systems that supply air to the living space of a house must not supply air to or ........... A furnace or air handler is prohibited from serving both the garage and living spaces. If a garage is conditioned, it must be by an independent HVAC system. Garage could contain contaminants that would affect the indoor air quality of the living spaces.

19. Don't test the AC if the outside air temperature is below _____________________°F.

passageway opening60°F12'HVAC systems that supply air to the living space of a house must not supply air to or ........... A furnace or air handler is prohibited from serving both the garage and living spaces. If a garage is conditioned, it must be by an independent HVAC system. Garage could contain contaminants that would affect the indoor air quality of the living spaces.

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

12'Perimeter Duct System - If you are inspecting a perimeter duct system, you should find supply registers located around the exterior walls of the room at the floor area. The return registers may be located at the ceiling of the inside wall.| | Plenum Duct System-If you are inspecting a plenum-duct system, then you should find a large rectangular duct that comes directly out of the heating system and runs in a straight line down the center of the basement, attic or ceiling. From the large rectangular plenum extension, you will find ducts branching out to all of the supply registers or heat-emitting units. The branching ducts are usually round, located between floor joists, and usually covered by a ceiling.| | Plenum duct systems are often called extended plenum duct systems because the large rectangular duct extends directly out of the supply outlet (or main plenum) of the heating system. The extended plenum duct system is common in most modern residential forced warm-air heating systems.| HVAC systems that supply air to the living space of a house must not supply air to or ........... A furnace or air handler is prohibited from serving both the garage and living spaces. If a garage is conditioned, it must be by an independent HVAC system. Garage could contain contaminants that would affect the indoor air quality of the living spaces.passageway opening

21. A common deficiency with vent hoods is that they are _____________________.

undersized12'passageway openingHVAC systems that supply air to the living space of a house must not supply air to or ........... A furnace or air handler is prohibited from serving both the garage and living spaces. If a garage is conditioned, it must be by an independent HVAC system. Garage could contain contaminants that would affect the indoor air quality of the living spaces.

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

23. Disadvantages of Warm-Air Heating Systems

12'Gravity warm-air systems have to be centrally located at the lowest level of the structure. - They are slow to respond to controls. - Air movement is slow. -Air filtering is restricted. -Forced warm-air heating systems require blower fans, which sometimes make noise. -The air movement may cause indoor air-quality issues because the air agitates dust and other particles. -Cool-air return inlets and warm-air supply registers must not be blocked, which sometimes interferes with the positioning of furniture. They also have some architectural design demands. -Warm air is supplied in bursts of convection heat, which may cause the air temperature in different rooms to vary.passageway openingHVAC systems that supply air to the living space of a house must not supply air to or ........... A furnace or air handler is prohibited from serving both the garage and living spaces. If a garage is conditioned, it must be by an independent HVAC system. Garage could contain contaminants that would affect the indoor air quality of the living spaces.

24. concentric cones or pyramids

Diffusers are typically formed in . They can be located on walls and are usually found on ceilings. Baseboard diffusers are used in perimeter forced warm-air heating systems.12'HVAC systems that supply air to the living space of a house must not supply air to or ........... A furnace or air handler is prohibited from serving both the garage and living spaces. If a garage is conditioned, it must be by an independent HVAC system. Garage could contain contaminants that would affect the indoor air quality of the living spaces.passageway opening

25. The dryer transition duct must be at least _____________________ feet in length.

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