WorksheetsChimney/Flue Systems Quiz
Total questions: 53
Worksheet time: 27mins
Which objective involves understanding the layout and features of construction?
Explain the effects of layout on chimney/flue systems
State the layout and features of chimney and flue construction
Identify the components within chimney/flue systems
Reference termination requirements for chimney/flue systems
What is the objective related to termination requirements for chimney/flue systems?
List basic inspection and testing procedures
Explain the operating principles of chimney/flue systems
Reference termination requirements from relevant documents
Identify types of chimney/flue systems
What are the two operating principles for any chimney or flue system?
Remove combustion products to the outside and draw in air for combustion.
Increase combustion temperature and reduce air intake.
Minimize heat loss and maximize fuel efficiency.
Enhance smoke production and decrease air flow.
What principle do chimneys and flue systems work on?
Hot gases rise, creating a pressure difference called 'up draught' via convection.
Cold air descends, creating a pressure difference called 'down draught' via conduction.
Heat is absorbed, creating a pressure difference called 'side draught' via radiation.
Air is compressed, creating a pressure difference called 'forward draught' via diffusion.
What is the primary purpose of a chimney or flue system?
To create an up draught to remove fumes
To provide heating
To circulate air within a room
To cool down the environment
What are the two types of flue designs mentioned?
Natural draught and room sealed
Mechanical draught and open sealed
Natural draught and mechanical sealed
Room draught and natural sealed
What is the primary function of open flues in heating systems?
To cool the room
To create an up draught for combustion
To circulate water
To provide electricity
How is air for combustion supplied in systems with open flues?
From a separate tank
From the outside via a vent
From the combustion chamber
From the water supply
What happens to the products of combustion in an open flue system?
They are stored in a tank
They are released into the room
They are removed up the flue by natural draught
They are converted into water
What is the purpose of a fan in an open flue system?
To cool down the appliance
To create a positive up draught
To reduce noise levels
To increase fuel efficiency
How does a fan in an open flue system affect the products of combustion?
It cools them down
It blows them up the flue
It filters them
It recycles them
What is the main advantage of room sealed (balanced) flues compared to open-flued appliances?
They are cheaper to install.
They are more energy efficient.
They are safer because the air does not enter the room.
They require less maintenance.
How do room sealed (balanced) flues draw air for combustion?
From inside the room.
From a separate air supply.
Directly from outside.
Through a chimney.
What are the two types of room sealed (balanced) flues mentioned?
Natural draught and electric.
Natural draught and fan assisted (forced).
Fan assisted (forced) and solar powered.
Electric and solar powered.
What is the function of the duct in a room sealed natural draught system?
To bring fresh air into the building
To evacuate products of combustion from the building
To circulate water within the heating system
To provide electrical power to the system
Where are both the combustion air and products of combustion situated in a room sealed natural draught system?
Inside the building
In separate locations outside the building
In the same position outside the building
In the basement of the building
What is the main function of the manufacturer's fan in a room sealed fan assisted system?
To increase the temperature of the flue gases
To ensure a positive and safe evacuation of all products
To reduce the noise of the system
To decrease the size of the flue
How does the size of the flue in a room sealed fan assisted system compare to a natural draught flue?
It is larger
It is the same size
It is much smaller
It is adjustable
Where can a room sealed fan assisted flue be positioned compared to a natural draught flue?
In fewer places
In the same places
In many more places
Only outdoors
What is the effect of positioning the fan on the combustion product’s outlet from the heat exchanger in a fan assisted boiler?
It creates a negative pressure (sucking) within the case.
It creates a positive pressure (blowing) within the case.
It increases the temperature of the boiler.
It reduces the efficiency of the boiler.
Where is the fan positioned in modern condensing boilers?
On the fresh air inlet.
On the combustion product’s outlet.
Inside the heat exchanger.
Near the water inlet.
What does positioning the fan on the fresh air inlet create in a fan assisted boiler?
A positive pressure (blowing).
A negative pressure (sucking).
A vacuum.
A decrease in air flow.
What is the primary function of the primary flue in an open flue appliance?
To connect the draught diverter to the appliance
To prevent wind and rain from entering the flue
To carry the products of combustion to the outside
To moderate pressure fluctuations in the flue system
Which component is responsible for moderating pressure fluctuations in the flue system?
Primary flue
Secondary flue
Draught diverter
Terminal
What is a requirement for the secondary flue in terms of its construction?
Must be at least 600 mm in length
Must not contain any 90° bends
Must be integrated with the appliance
Must have a draught diverter
What is the role of the terminal in an open flue system?
To connect the draught diverter to the appliance
To help the flue gases discharge to the atmosphere
To moderate pressure fluctuations
To prevent the loss of flame stability
How does the design and installation of chimney and flue systems affect their function?
It affects the color of the chimney.
It affects the function of air intake and dispersion of combustion products.
It affects the temperature of the room.
It affects the noise level in the house.
What needs to be considered carefully when designing chimney and flue systems?
The color of the bricks.
The height of the building.
Several factors related to design and installation.
The type of fuel used.
What is the recommended minimum angle for bends in chimney/flue systems to reduce frictional resistance?
30 degrees
45 degrees
60 degrees
90 degrees
Why is the effective height of a chimney different from the physical measured height?
It accounts for temperature changes.
It includes the length of the chimney.
It considers the frictional resistance encountered en route.
It measures the width of the chimney.
What is necessary for a flue to work efficiently?
The temperature needs to rise quickly and remain constant.
The temperature should decrease gradually.
The flue gases should move slowly.
The flue should remain cool.
What can happen when the flue is cool?
Flue gases move efficiently upwards.
Flue gases move slowly, creating condensation and potential spillage.
The chimney heats up in 2 minutes.
The temperature remains constant.
How long can it take for the chimney/flue to heat up fully?
1-2 minutes
3-4 minutes
5-10 minutes
15-20 minutes
What is the required velocity for safe evacuation of flue gases?
4 m/s
5 m/s
6 m/s
7 m/s
How should the opening of a terminal compare to the cross-sectional area of the flue?
Equal to the cross-sectional area
Twice the cross-sectional area
Half the cross-sectional area
Three times the cross-sectional area
Where should a terminal be located to avoid being a nuisance?
Inside a pressure zone
Outside a pressure zone
Near a window
Next to a door
What is the minimum flue height termination for a pitched roof with a net input of less than 70 kW?
At ridge, or 600 mm above or at least 1.5 m measured horizontally to the roof line
600 mm above the roof line
250 mm above the roof line
1000 mm above the roof line
For a flat roof with a parapet or external flue and a net input of less than 70 kW, what is the minimum flue height termination?
At ridge, or 600 mm above or at least 1.5 m measured horizontally to the roof line
600 mm above the roof line
250 mm above the roof line
1000 mm above the roof line
What is the minimum flue height termination for a flat roof without a parapet and providing an internal routed flue with a net input of less than 70 kW?
At ridge, or 600 mm above or at least 1.5 m measured horizontally to the roof line
600 mm above the roof line
250 mm above the roof line
1000 mm above the roof line
For a roof with a net input greater than 70 kW, what is the minimum flue height termination?
At ridge, or 600 mm above or at least 1.5 m measured horizontally to the roof line
600 mm above the roof line
250 mm above the roof line
1000 mm above the roof line
What are the types of rigid chimneys mentioned in the document?
Brick and masonry, Pre-cast blocks, Metallic flues
Wooden structures, Plastic pipes, Glass tubes
Stone pillars, Concrete slabs, Iron rods
Fiberglass sheets, Aluminum panels, Copper wires
What is another type of chimney construction mentioned besides rigid chimneys?
Flexible liners
Wooden frames
Plastic ducts
Glass enclosures
What were rigid-brick and masonry chimneys (class 1 flue) designed for?
Fireplaces or appliances
Outdoor grills
Water heaters
Air conditioning units
What were the dimensions of chimneys installed prior to 1966?
9" x 9" or 225mm x 225mm
10" x 10" or 250mm x 250mm
8" x 8" or 200mm x 200mm
12" x 12" or 300mm x 300mm
What materials were used for chimneys after 1966?
Clay, pumice, or concrete
Wood, metal, or glass
Plastic, rubber, or steel
Stone, brick, or aluminum
Why were larger chimneys considered unsuitable for gas appliances after 1966?
They caused the flue gases to slow down too much
They were too expensive to build
They were difficult to clean
They were not aesthetically pleasing
What material are pre-cast flue blocks made from?
Wood
Metal
Concrete
Plastic
What is a common problem with pre-cast flue blocks?
They are too expensive
The 'pull' can be quite poor
They are difficult to install
They are not durable
Can all gas appliances be installed on pre-cast flue block systems?
Yes, all can be installed
No, not all can be installed
Only electric appliances can be installed
Only small appliances can be installed
What should always be checked when dealing with pre-cast flue blocks?
The color of the blocks
The manufacturer's instructions
The weight of the blocks
The price of the blocks
What material are rigid-metallic flue systems typically made from?
Aluminum
High grade stainless steel
Copper
Plastic
What is a key feature of twin wall flue systems?
They are only used externally
They are made of plastic
They create a barrier against condensation and heat
They are suitable only for Agas
For what applications is a single wall flue system suitable?
Only for external use
For lining a chimney and some Agas and stoves
For use with plastic pipes
For electrical wiring
