Podcast
Questions and Answers
The key components of a building as a system are:
The key components of a building as a system are:
- the building envelope, external environment, mechanical systems, and the occupants. (correct)
- the building envelope and the occupants.
- the building envelope, mechanical systems, external environment, and the building structure.
- the building envelope, mechanical systems, occupants, and the internal environment.
As the number of occupants in a tightly-constructed building increases, the:
As the number of occupants in a tightly-constructed building increases, the:
- relative humidity increases. (correct)
- carbon monoxide level increases.
- carbon monoxide level decreases.
- relative humidity decreases.
Indoors in winter, if a vapor barrier has not been made continuous, the:
Indoors in winter, if a vapor barrier has not been made continuous, the:
- heat gain will increase. (correct)
- relative humidity will increase.
- heat loss will decrease.
- relative humidity will decrease.
A poorly insulated building could result in:
A poorly insulated building could result in:
The main purpose of the building skin is to:
The main purpose of the building skin is to:
A forced air furnace uses a ____________ form of heat transfer to heat a home.
A forced air furnace uses a ____________ form of heat transfer to heat a home.
Conduction is:
Conduction is:
Sources of heat gain in a building are:
Sources of heat gain in a building are:
The wind effect on a building is the result of:
The wind effect on a building is the result of:
The prime reasons for excess moisture in a building are:
The prime reasons for excess moisture in a building are:
In the heating season, introducing ventilation air to the building will:
In the heating season, introducing ventilation air to the building will:
When air is heated, its relative humidity:
When air is heated, its relative humidity:
Vapor barriers should be installed on:
Vapor barriers should be installed on:
Air barriers:
Air barriers:
Currently, the most common type of building construction is:
Currently, the most common type of building construction is:
To reduce heat loss the most effective thing to do is to:
To reduce heat loss the most effective thing to do is to:
With respect to heat loss, the most important area to seal against air leaks is:
With respect to heat loss, the most important area to seal against air leaks is:
The best way to seal against air leaks is to:
The best way to seal against air leaks is to:
The most important element required for proper combustion in a gas appliance is:
The most important element required for proper combustion in a gas appliance is:
Which of the following can cause negative pressure in a building?
Which of the following can cause negative pressure in a building?
Which is the most common cause of flue gas spillage from gas appliances?
Which is the most common cause of flue gas spillage from gas appliances?
If air for combustion comes from inside the house, it is replaced with:
If air for combustion comes from inside the house, it is replaced with:
The instrument used to perform a passive depressurization test is a:
The instrument used to perform a passive depressurization test is a:
The Ontario Building Code states that master bedrooms must have a minimum ventilation air supply of:
The Ontario Building Code states that master bedrooms must have a minimum ventilation air supply of:
Excessive moisture in a building:
Excessive moisture in a building:
The best way to remove odours from a house is to:
The best way to remove odours from a house is to:
The best method of removing dust from a house is by:
The best method of removing dust from a house is by:
Air leaves a house through a process called:
Air leaves a house through a process called:
Air enters a house through a process called:
Air enters a house through a process called:
An exhaust air fan in a bathroom:
An exhaust air fan in a bathroom:
What is the minimum size of a combustion air opening from outdoors for an appliance with a draft hood and having an input of 125,000 Btuh installed in a structure that has a continuous vapor barrier and has an equivalent leakage area of 0.05 m2 at a differential pressure of 10 Pascals (Pa) and dimensions of 10 ft. x 10 ft. x 20 ft.?
What is the minimum size of a combustion air opening from outdoors for an appliance with a draft hood and having an input of 125,000 Btuh installed in a structure that has a continuous vapor barrier and has an equivalent leakage area of 0.05 m2 at a differential pressure of 10 Pascals (Pa) and dimensions of 10 ft. x 10 ft. x 20 ft.?
What is the minimum size of the combustion air opening from outdoors for an appliance without a draft hood and with an input of 50,000 Btuh installed in a structure which has an equivalent leakage area greater than 0.05 m2 and dimensions of 10 ft. x 10 ft. x 20 ft.?
What is the minimum size of the combustion air opening from outdoors for an appliance without a draft hood and with an input of 50,000 Btuh installed in a structure which has an equivalent leakage area greater than 0.05 m2 and dimensions of 10 ft. x 10 ft. x 20 ft.?
Determine the minimum required size of the combustion air opening from outdoors given the following information: There are two appliances in a 10 ft. x 10 ft. x 20 ft. structure which has an equivalent leakage area greater than 0.05 m2. A furnace has a draft hood and an input of 50,000 Btuh. The second appliance has an input of 75,000 Btuh and does not have a draft hood. The required combustion air opening size is:
Determine the minimum required size of the combustion air opening from outdoors given the following information: There are two appliances in a 10 ft. x 10 ft. x 20 ft. structure which has an equivalent leakage area greater than 0.05 m2. A furnace has a draft hood and an input of 50,000 Btuh. The second appliance has an input of 75,000 Btuh and does not have a draft hood. The required combustion air opening size is:
An air supply opening from the outdoors shall be located not less than _____ inches above the outside grade level.
An air supply opening from the outdoors shall be located not less than _____ inches above the outside grade level.
When an air supply duct is used to provide the outside air supply, it shall terminate within _____ feet above, and within _____ feet horizontally from the burner level of the appliance having the largest input.
When an air supply duct is used to provide the outside air supply, it shall terminate within _____ feet above, and within _____ feet horizontally from the burner level of the appliance having the largest input.
To ensure the main burner cannot operate unless the dampers are in the fully open position, electrically operated automatic combustion air dampers shall be:
To ensure the main burner cannot operate unless the dampers are in the fully open position, electrically operated automatic combustion air dampers shall be:
When a baffle is required to prevent the direct entry of rain into an air supply opening, by how much can the baffle reduce the required free area of the opening?
When a baffle is required to prevent the direct entry of rain into an air supply opening, by how much can the baffle reduce the required free area of the opening?
The smallest dimension of a combustion air supply duct must not be less than:
The smallest dimension of a combustion air supply duct must not be less than:
What is the minimum size required for the air supply opening given the information listed below? All appliances are equipped with draft diverters, the building is of recent construction with close fitting windows and doors, vapor barrier and drywall and the total input of all appliances is 310,000 Btuh.
What is the minimum size required for the air supply opening given the information listed below? All appliances are equipped with draft diverters, the building is of recent construction with close fitting windows and doors, vapor barrier and drywall and the total input of all appliances is 310,000 Btuh.
What causes negative pressure in a building?
What causes negative pressure in a building?
What effect could negative pressure in a building have on the venting of an appliance?
What effect could negative pressure in a building have on the venting of an appliance?
A boiler room contains the following natural draft appliances: Two hot water boilers, each firing at 750,000 Btuh; 1 water heater firing at 270,000 Btuh; 1 water heater firing at 30,000 Btuh. What is the minimum required combustion air opening?
A boiler room contains the following natural draft appliances: Two hot water boilers, each firing at 750,000 Btuh; 1 water heater firing at 270,000 Btuh; 1 water heater firing at 30,000 Btuh. What is the minimum required combustion air opening?
A boiler room contains the following natural draft appliances: Two hot water boilers, each firing at 750,000 Btuh; 1 water heater firing at 270,000 Btuh; 1 water heater firing at 30,000 Btuh. Consider the grill to have 80% free area. What size in square inches should the grill be?
A boiler room contains the following natural draft appliances: Two hot water boilers, each firing at 750,000 Btuh; 1 water heater firing at 270,000 Btuh; 1 water heater firing at 30,000 Btuh. Consider the grill to have 80% free area. What size in square inches should the grill be?
Ventilation air openings for gas appliances should be located:
Ventilation air openings for gas appliances should be located:
There is a new forced air furnace equipped with an induced draft fan beside a conventional water heater in a basement. The customer has decided to enclose the area to make a separate furnace room. The house is approximately 25 years old and has a door separating the basement from the upper levels. What size opening is required in the furnace room door to provide sufficient ventilation air for the furnace room?
There is a new forced air furnace equipped with an induced draft fan beside a conventional water heater in a basement. The customer has decided to enclose the area to make a separate furnace room. The house is approximately 25 years old and has a door separating the basement from the upper levels. What size opening is required in the furnace room door to provide sufficient ventilation air for the furnace room?
In a recently constructed building with close fitting windows and doors, vapor barrier and drywall, there is a single water heater with a draft diverter firing at 48,000 Btuh. In square inches, what size of supply opening is required?
In a recently constructed building with close fitting windows and doors, vapor barrier and drywall, there is a single water heater with a draft diverter firing at 48,000 Btuh. In square inches, what size of supply opening is required?
The recommended range of relative humidity in a house to control indoor air contaminants, increase comfort, and maintain the structural integrity of the house is:
The recommended range of relative humidity in a house to control indoor air contaminants, increase comfort, and maintain the structural integrity of the house is:
The minimum required number of air changes per hour (ACH) in a residence to maintain a healthy indoor air quality is:
The minimum required number of air changes per hour (ACH) in a residence to maintain a healthy indoor air quality is:
From the following list, which action will have the greatest effect on reducing mold?
From the following list, which action will have the greatest effect on reducing mold?
Elevated levels of CO in a building may be caused by:
Elevated levels of CO in a building may be caused by:
After a direct vent radiant heating system is installed in a new house, the customer complains that, "The walls and windows are wet." From the following list, what is the most reasonable response?
After a direct vent radiant heating system is installed in a new house, the customer complains that, "The walls and windows are wet." From the following list, what is the most reasonable response?
The "systems approach" as it applies to a building is a means of understanding how fuel-fired appliances affect and are affected by the:
The "systems approach" as it applies to a building is a means of understanding how fuel-fired appliances affect and are affected by the:
The "stack effect" is caused by:
The "stack effect" is caused by:
The flue and ventilation effect in a building causes:
The flue and ventilation effect in a building causes:
Which of the following heating systems would be expected to cause problems due to the "distribution effect?"
Which of the following heating systems would be expected to cause problems due to the "distribution effect?"
The maximum negative building pressure that a natural draft vented appliance should be exposed to is:
The maximum negative building pressure that a natural draft vented appliance should be exposed to is:
As the temperature difference between outdoors and indoors increases the stack effect:
As the temperature difference between outdoors and indoors increases the stack effect:
The best way to limit the problems caused by the "stack effect" on vented appliances is to:
The best way to limit the problems caused by the "stack effect" on vented appliances is to:
Which of the following actions will limit the problems caused by the "distribution effect" on conventional vented forced air furnaces?
Which of the following actions will limit the problems caused by the "distribution effect" on conventional vented forced air furnaces?
To ensure that negative building pressure never causes pressure-induced backdrafting:
To ensure that negative building pressure never causes pressure-induced backdrafting:
A proper heat loss calculation has been performed for a house which requires a furnace replacement. The numbers indicate the heat loss is 100,000 Btu/h. Which of the following furnaces should be selected for the installation?
A proper heat loss calculation has been performed for a house which requires a furnace replacement. The numbers indicate the heat loss is 100,000 Btu/h. Which of the following furnaces should be selected for the installation?
A depressurization test conducted on a house will help determine the:
A depressurization test conducted on a house will help determine the:
Which symbol represents a gas solenoid?
Which symbol represents a gas solenoid?
Which symbol represents the dryer heat thermostat?
Which symbol represents the dryer heat thermostat?
Which symbol represents a dryer high limit switch?
Which symbol represents a dryer high limit switch?
Which symbol represents a dryer centrifugal switch?
Which symbol represents a dryer centrifugal switch?
Which symbol represents a dryer pilot switch?
Which symbol represents a dryer pilot switch?
Which symbol represents a timer motor?
Which symbol represents a timer motor?
What device is used to prove a dryer motor is running?
What device is used to prove a dryer motor is running?
When can moisture exhaust ducts from clothes dryers be screwed together?
When can moisture exhaust ducts from clothes dryers be screwed together?
How far should a dryer moisture exhaust duct terminate from a service regulator?
How far should a dryer moisture exhaust duct terminate from a service regulator?
When does a gas dryer have to be vented outdoors?
When does a gas dryer have to be vented outdoors?
Moisture exhaust duct sections on a residential dryer shall be joined with:
Moisture exhaust duct sections on a residential dryer shall be joined with:
Which device shuts off the spark igniter in a spark ignition dryer after proper ignition?
Which device shuts off the spark igniter in a spark ignition dryer after proper ignition?
The bypass or minimum burner flame on a direct acting modulating oven control:
The bypass or minimum burner flame on a direct acting modulating oven control:
A Therm-O-Disc operating the door locking mechanism in a self-cleaning oven activates:
A Therm-O-Disc operating the door locking mechanism in a self-cleaning oven activates:
How long may a corrugated flexible connector be when installed on a range?
How long may a corrugated flexible connector be when installed on a range?
What minimum clearance is required from the sides of a domestic clothes dryer to combustible material unless otherwise approved?
What minimum clearance is required from the sides of a domestic clothes dryer to combustible material unless otherwise approved?
What type of protection does a range require if it is certified for zero side clearance from combustible material?
What type of protection does a range require if it is certified for zero side clearance from combustible material?
What is the minimum clearance from the sides of a domestic range to combustible materials, unless otherwise specified?
What is the minimum clearance from the sides of a domestic range to combustible materials, unless otherwise specified?
The mantle of a gas lamp:
The mantle of a gas lamp:
The required clearance to combustible materials above a pendant type gas lamp is:
The required clearance to combustible materials above a pendant type gas lamp is:
If too many lava rocks are placed in the rack of a barbeque:
If too many lava rocks are placed in the rack of a barbeque:
What type of gas connector may be used to connect a barbeque to house piping?
What type of gas connector may be used to connect a barbeque to house piping?
What are the main components of a gas-fired refrigerator?
What are the main components of a gas-fired refrigerator?
Is it permissible to use the propane side of a refrigerator in a recreational vehicle while the vehicle is in motion?
Is it permissible to use the propane side of a refrigerator in a recreational vehicle while the vehicle is in motion?
What kind of propane refrigerator can be installed in a recreational vehicle?
What kind of propane refrigerator can be installed in a recreational vehicle?
How often should a refrigerator be serviced and cleaned?
How often should a refrigerator be serviced and cleaned?
A three-way refrigerator runs on:
A three-way refrigerator runs on:
When a refrigerator develops excessive frost on the evaporator:
When a refrigerator develops excessive frost on the evaporator:
What type of room heater may be installed in a bathroom?
What type of room heater may be installed in a bathroom?
A room heater installed in either a sleeping area or a public area shall be:
A room heater installed in either a sleeping area or a public area shall be:
What must be done during the installation of a "gas log" fireplace?
What must be done during the installation of a "gas log" fireplace?
What is the required clearance from combustibles above a free-standing radiant room heater?
What is the required clearance from combustibles above a free-standing radiant room heater?
When can a natural draft decorative appliance be installed in a bedroom?
When can a natural draft decorative appliance be installed in a bedroom?
What type of vent must be used when the vent of a wall furnace will be concealed in a partition wall?
What type of vent must be used when the vent of a wall furnace will be concealed in a partition wall?
When can a certified hose be used to connect a construction heater to temporary piping?
When can a certified hose be used to connect a construction heater to temporary piping?
Which of the following is acceptable when a fireplace insert is installed?
Which of the following is acceptable when a fireplace insert is installed?
An unvented infra-red heater can be installed in ____________ appliances.
An unvented infra-red heater can be installed in ____________ appliances.
Dirt pockets are required on:
Dirt pockets are required on:
Flashcards
Building System Components
Building System Components
Building envelope, mechanical systems, occupants, and internal environment.
Effect of Occupants on Humidity
Effect of Occupants on Humidity
Relative humidity increases as more people occupy a tightly constructed building.
Vapor Barrier Effect on Heat Gain
Vapor Barrier Effect on Heat Gain
Heat gain will increase indoors during winter if a vapor barrier isn't continuous.
Impact of Poor Insulation
Impact of Poor Insulation
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Purpose of Building Skin
Purpose of Building Skin
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Conduction
Conduction
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Sources of Heat Gain
Sources of Heat Gain
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Wind effect on a Building
Wind effect on a Building
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Reasons for Excess Moisture
Reasons for Excess Moisture
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Ventilation Air in Heating Season
Ventilation Air in Heating Season
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Vapor Barrier Placement
Vapor Barrier Placement
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Reducing Heat Loss
Reducing Heat Loss
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Most Important Area to Seal
Most Important Area to Seal
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Best Air Leak Sealant
Best Air Leak Sealant
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Combustion Element
Combustion Element
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Causes of Negative Pressure
Causes of Negative Pressure
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Replacement Air
Replacement Air
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Depressurization Test Tool
Depressurization Test Tool
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Ontario Building Code: Master Bedroom Ventilation
Ontario Building Code: Master Bedroom Ventilation
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Reducing Mould
Reducing Mould
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Causes of elevated COâ‚‚
Causes of elevated COâ‚‚
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"Systems Approach" Meaning
"Systems Approach" Meaning
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Seal the lower building envelope with an air barrier and caulking.
Seal the lower building envelope with an air barrier and caulking.
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Changes a blue flame to a luminous flame.
Changes a blue flame to a luminous flame.
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generator, evaporator, absorber, condenser
generator, evaporator, absorber, condenser
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Study Notes
Building Components
- A building operates as a system with key components
- These include the building envelope, mechanical systems, occupants, and the internal environment
Occupancy and Humidity
- Relative humidity increases as occupancy increases in tightly constructed buildings
Vapor Barriers in Winter
- Heat gain will increase indoors during winter, when a vapor barrier is not continuous
Poor Insulation Consequences
- Poorly insulated buildings often result in increased fuel consumption
Building Skin Purpose
- The primary function of a building's skin is to protect underlying materials
Heat Transfer in Furnaces
- Forced air furnaces use conductive heat transfer
Conduction Defined
- Conduction transfers heat from particle to particle
Building Heat Gain Sources
- Common sources of heat gain in buildings are windows, doors, and walls
Wind Effects on Buildings
- Wind creates positive pressure on the windward side and negative pressure on the leeward side of a building
Excessive Moisture Reasons
- New construction materials, open sump pits, and poor air barriers are prime reasons for excessive moisture in buildings
Ventilation in Heating Season
- Introducing ventilation air during the heating season decreases the moisture content of the air
Relative Humidity and Heating
- When air is heated, its relative humidity decreases
Vapor Barrier Placement
- Vapor barriers should be installed on the warm side of the insulation
Air Barrier Function
- Air barriers prevent moisture travel through building walls
Common Building Construction
- Platform construction is currently the most common type of building construction
Reducing Heat Loss
- Sealing air leaks is most effective for reducing heat loss
Important Air Leak Area
- The most important area to seal against air leaks is around windows
Sealing Air Leaks
- Caulking is the best method for sealing air leaks
Combustion Requirement
- Air is the most important element for proper combustion in gas appliances
Negative Pressure Causes
- A lack of makeup or combustion air causes negative pressure in a building
Flue Gas Spillage
- Mechanical systems causing negative air pressure are a common cause of flue gas spillage from gas appliances
Combustion Air Replacement
- Outside air that infiltrates a house replaces air used for combustion
Depressurization Test Instrument
- A passive depressurization test requires a magnehelic gauge
Ontario Building Code Ventilation
- The Ontario Building Code mandates a minimum ventilation air supply of 10 cfm for master bedrooms
Excessive Moisture Impact
- Excessive moisture harms building construction
Odor Removal
- Ventilating a house is the most effective way to remove odors
Dust Removal Method
- Filtration is the best method for removing dust from a house
Air Leaving a House
- Air leaves a house through exfiltration
Air Entering a House
- Air enters a house through infiltration
Bathroom Exhaust Fan Purpose
- Bathroom exhaust fans help reduce excessive moisture buildup
Combustion Air Opening Size
- A combustion air opening from outdoors should be a minimum of 18 square inches (116 cm2) for an appliance with a draft hood and 125,000 Btuh input in a structure with a continuous vapor barrier, equivalent leakage area of 0.05 m2 at 10 Pascals, and dimensions of 10 ft. x 10 ft. x 20 ft.
Appliance Air Opening Size
- The minimum size of a combustion air opening from outdoors is 0 square inches (0 mm2) for an appliance without a draft hood and with an input of 50,000 Btuh installed in a structure with an equivalent leakage area greater than 0.05 m? and dimensions of 10 ft. x 10 ft. x 20 ft.
Combustion Air Opening Size Calculation
- Minimum combustion air opening size is 9 square inches (5800 mm2) when there are two appliances in a 10 ft. x 10 ft. x 20 ft. structure with leakage area greater than 0.05 m2, where a furnace has a draft hood and 50,000 Btuh input, and the second appliance has 75,000 Btuh input without a draft hood.
Air Supply Opening Location
- An air supply opening from the outdoors must be located at least 12 inches (300 mm) above the outside grade level
Air Supply Duct Termination
- The air supply duct used to provide outside air, must terminate within 1 ft. above and 2 ft. horizontally from the burner level of the appliance having the largest input (0.3 m, 0.6 m).
Combustion Air Dampers
- Electrically operated automatic combustion air dampers must be interlocked with the burner control system, ensuring the main burner operates only when dampers are fully open
Baffle Reduction of Area
- When a baffle is needed to prevent rain from entering an air supply opening, the baffle can reduce the required free area of the opening by 1%
Combustion Air Supply Duct
- The smallest dimension of a combustion air supply duct cannot be less than 3/2" (50 mm)
Air Supply Opening Requirements
- With appliances equipped with draft diverters in buildings of recent construction with close-fitting windows and doors, vapor barrier, and drywall, and the total input of all appliances is 310,000 Btuh; the minimum required air supply opening size is 47 square inches (30000 mm2)
Negative Pressure Causes
- The volume of air leaving the building exceeding the volume of air entering it causes negative pressure in a building.
Negative Pressure Effects on Venting
- Negative pressure in a building may cause a downdraft condition at appliances.
Boiler Room Combustion Air Opening
- A boiler room contains Two hot water boilers, each firing at 750,000 Btuh, 1 water heater firing at 270,000 Btuh and 1 water heater firing at 30,000 Btuh
- The minimum required combustion air opening is 200 square inches
Grill Size Calculation
- A boiler room contains Two hot water boilers, each firing at 750,000 Btuh, 1 water heater firing at 270,000 Btuh and 1 water heater firing at 30,000 Btuh
- With the grill having 80% free area.
- The grill szie is 250 square inches (200 / 80% = 250)
Ventilation Air Opening Placement
- Ventilation air openings for gas appliances should be located at the highest practical point communicating with outdoors
Ventilation
- Furnace Input = 100,000 Btuh
- AWH Input = 25,000 Btuh
- Enclosure = 10' x 20' x 7'
- Structure dimensions = 20'* 30' x 7'x 3 (levels)
- The opening size required is 18 square inches
Draft Diverter Water Heater
- For a with a single water heater with a draft diverter firing at 48,000 Btuh in a recently constructed building; 0 square inches of supply opening is required
Recommended Relative Humidity
- The recommended range of relative humidity in a house to control indoor air contaminants, increase comfort, and maintain structural integrity is 30% to 50%
Air Changes
- Indoor air quality is maintaned by 1 air change per hour in a residence
Greatest Effect on Mould Reduction
- Mould is reduced most effectively when covering earthen floors and open water surfaces (sumps, aquariums etc.)
Elevated CO2 Causes:
- Elevated CO2 levels in a building can be caused by the activities of the occupants, spillage of flue gases, and/or lack of ventilation
Mechanical Ventilation System
- Recommending the installation of a mechanical ventilation system addresses the customer's complaints of "The walls and windows are wet," after installing a direct vent radiant heating system
Systems Approach
- The "systems approach" to a building acknowledges that fuel-fired appliances affect, and are affected by, occupants, the outside environment, and the building itself
Stack Effect Cause
- The "stack effect" results from the mechanical ventilation system
Effect of Warm Air
- Warm air leaving through openings and cracks will cause negative pressure in the basement and starve appliances
Flue and Ventilation Effect:
- Flue and ventilation cause is air inflitration
Distribution Effect
- Problems caused by the "distribution effect" will be created in forced air furnace with no return air openings in the furnace room
Draft Vented Appliance's Pressure Exposure
- The maximum negative building pressure that should expose natural draft vented appliance is -5 Pa (-0.02" WC.)
Stack Effect’s Effect on Appliances
- As there is an increase in temperature differences, there is also an increase in the draft action of vented appliances
Vented Appliances
- The best way to limit problems created by the "stack effect" on vented appliances is to seal the lower building envelope with an air barrier and caulking
Distribution Effect on Furnaces
- Actions limiting problems caused by the "distribution effect" on conventional vented forced air furnaces include: balancing the volume of return and supply air, a tight seal around the furnace filter and blower door, and sealed duct work
Ensuring No Pressure Backdrafting
- Sealed combustion and direct vent appliances ensure that negative building pressure never causes pressure-induced backdrafting
Heat Loss Requirement
- The user is aiming to replace a furnace as the heatloss is at 100,00.0 Btu/h
- A furnace is selected with a 120.000 Btu/h input furnace and an 85% AFUE rating
Determining Depressurization
- A depressurization tests determines whether pressure-induced backdrafting occurs
Gas Solenoid
- Symbol 6 on the diagram represents a gas solenoid
Dryer Heat Thermostat
- Dryer heat thermostat is represented by reference number 2
Dryer High Limit Switch
- Reference Number 3 represents the dryer high limit switch
Dryer Centrifugal Switch
- Reference number 7 represents a dryer centrifugal switch
Dryer Pilot Switch
- Reference number 2 represents a dryer pilot switch
Device to Prove a Dryer Motor
- Dryer operating is proven by Centrifugal switch
Moisture Exhaust Ducts
- Moisture exhaust ducts from clothes dryers should never be screwed together
Dryer Moisture Exhaust Duct
- A dryer moisture exhaust duct should terminate 36 inches (90 cm) from a service regulator
Dryer Venting
- Gas dryers should always be vented outdoors
Moisture Exhaust Ducts
- Moisture exhaust duct sections on a residential dryer should be joined with duct tape
Drying Ignition
- A Limit switch shuts off the spark igniter in a spark ignition dryer after proper ignition
Oven Control
- The bypass or minimum burner flame on a direct acting modulating oven control maintains a minimum oven temperature
Self Cleaning Oven
- A Therm-O-Disc activates at 650 degrees F (340 degrees C) to operate the door locking mechanism in a self-cleaning oven
Flexible Connector Length
- A corrugated flexible gas connector can be installed on arange at a maximum length of 6 feet
Dryer Clearance
- 6 inches (15 cm) is the minimum clearance required from the sides of a domestic clothes dryer to combustible material unless otherwise approved
Range Protection
- A range certified for zero side clearance from combustible material requires 28 MSG (0.3 mm) sheet metal spaced out 0.25 inch (6 mm)
Side Clearance
- 6 inches (150 mm) is the minimum clearance from the sides of a domestic range to combustible materials, unless otherwise specified
Gas Lamp Mantle Function
- The mantle of a gas lamp changes a blue flame to a luminous flame
Pendant Lamp Clearance
- Pendant type gas lamps require a clearance of 18 inches (450 mm) to combustible materials
Too Many Lava Rocks
- Too many lava rocks in the rack of a barbeque will cause a burner to burn out prematurely
Connecting Barbeque to Piping
- An approved hose should be used to connect a barbeque to house piping
Gas-Fired Refrigerator Components
- The main components of a gas-fired refrigerator are a generator, evaporator, absorber, and condenser
Propane Refrigerator Motion
- A propane refrigerator is prohibited to use in a recreational vehicle while the vehicle is in motion
Refrigerator Installed in Vehicles
- An approved direct vent type or equivalent is needed to install a propane refrigerator in a recreational vehicle
Refrigerator Service
- Refrigerators should be serviced and cleaned once a year or as recommended by the manufacturer
How a Three-Way Refrigerator Runs
- A three-way refrigerator runs on propane, 12 volts d. and 120, volts a.c/
Refrigerator Frost
- When a refrigerator develops excessive frost on the evaporator, it becomes less efficient
Type of Room Heater in Bathrooms
- A direct vent room heater may be installed in a bathroom
Room Heater Requirements
- Any room heater installed in either a sleeping area or a public area must be equipped with a regulator
Gas Log Fireplace
- The chimney damper should be secured in the open position during the installation of a "gas log" fireplace
Freestanding
- A 36"(900 mm) minimum is required for clearance from combustibles above a free-standing radiant room heater
Natural Draft Decorative Appliance
- A natural draft decorative appliance may only be installed in bedrooms if it has certification
Vent usage
- BW vent type of vent must be used when the vent of a wall furnace will be concealed in a partition wall
Temporary Hose
- A certified hose is allowed for connecting a Construction heater with a installed lever handle shut off
Fireplace Insert
- A metal chimney liner is needed when performing fireplace inserts
Infrared Heater Placement
- An unvented infra-red heater can be installed in an industrial, warehouse and a commercial appliances.
Dirt Pockets
- Dirt pockets are not required on gas logs, room heaters and decorative appliances.
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