311 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 decrease air flow.

• Reduce air pressure and increase fuel consumption.

• Enhance smoke production and reduce heat loss.

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.

• Hot gases fall, creating a pressure difference called 'down draught' via radiation.

• Cold air rises, creating a pressure difference called 'up draught' via diffusion.

What is the primary purpose of a chimney or flue system?

• To create a decorative feature

• To provide heating

• To create an up draught to remove fumes

• To support the roof structure

Which of the following is a type of flue design?

• Mechanical draught

• Natural draught

• Electric draught

• Solar draught

What is another type of flue design besides natural draught?

• Open sealed

• Room sealed

• Air sealed

• Water sealed

What is the primary function of an open flue in a heating appliance?

• To provide a decorative element

• To supply water to the appliance

• To remove combustion products by natural draught

• To cool the appliance

How is air for combustion supplied to an appliance with an open flue?

• Through a built-in fan

• From the room via a vent

• Directly from the fuel source

• Through a water pipe

What are the two types of draughts that can be used in open flues?

• Mechanical and electrical

• Natural and forced

• Hydraulic and pneumatic

• Static and dynamic

What is the purpose of a fan in an open flue with forced draught?

• To cool down the appliance

• To create a positive up draught

• To reduce noise from the appliance

• To increase fuel efficiency

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 air does not enter the room.

• They require less maintenance.