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What are the two operating principles for any chimney or flue system according to the Level 3 Diploma in Plumbing and Domestic Heating?

• Remove water vapor and draw in air for combustion.

• Remove combustion products to the outside and draw in air for combustion.

• Filter particulates and recycle heat back into the system.

• Create a vacuum and circulate warm air.

On what principle do the operating principles of a chimney or flue system work?

• The principle that cold gases sink, creating a pressure difference called 'down draught' via conduction.

• The principle that hot gases rise, creating a pressure difference called 'up draught' via convection.

• The principle that gases expand when heated, creating a pressure difference called 'out draught' via radiation.

• The principle that gases contract when cooled, creating a pressure difference called 'in draught' via conduction.

What is the basic concept of a chimney or flue system?

• To cool down the air inside a room

• To create this up draught, either by natural or mechanical means, in order to get rid of the fumes

• To filter and clean the air within a building

• To circulate warm air throughout a building

Which of the following is a type of flue design?

• Forced draught

• Natural draught

• Electrical draught

• Hybrid draught

What is the other flue design mentioned in the text apart from natural draught?

• Mechanically sealed

• Room sealed

• Environmentally sealed

• Pressure sealed

What is the simplest design of all flues that relies on heat rising to create the up draught?

• Forced draught flue

• Balanced flue

• Open flue

• Power flue

Where is the air for combustion taken from in an appliance with an open flue?

• From outside the building

• From the combustion chamber

• From the room in which the appliance is located

• From the secondary flue

How are the products of combustion removed in an appliance with an open flue?

• Through a vent in the room

• Up the flue by natural draught

• Directly outside through a side vent

• By being recycled into the combustion chamber

What must be supplied to the room and appliance from outside via a vent in an open flue system?

• Natural gas

• Electricity

• Air for combustion

• Water for cooling

What is the purpose of the fan in an open flue with forced draught as described in the learning material?

• To cool down the appliance

• To create a positive up draught by blowing the products of combustion up the flue

• To filter the products of combustion

• To supply fresh air into the appliance