Domestic Fuel Systems 3

What is the main purpose of flues and chimneys in plumbing?

• To create a decorative feature

• To provide ventilation

• To remove combustion products to the outside

• To increase indoor humidity

What creates the pressure difference known as updraught in a chimney?

• The presence of a fan

• The temperature of the outside air

• The height of the chimney

• The density of the flue gases

What affects the amount of updraught created by a chimney?

• The presence of a rain cap

• The height of the chimney

• The color of the chimney

• The type of fuel used

What are the three basic categories of flue types for central heating appliances?

• Natural, Forced, Balanced

• A, B, C

• Flueless, Open-flued, Room-sealed

• Single-walled, Double-walled, Flexible

What type of flue is suitable for gas appliances and works by relying on the heat of the flue gases to create an updraught?

• Rigid double-walled flue

• Rigid single-walled flue

• Open flue

• Flexible single-walled flue

What is the purpose of a double-walled metal chimney?

• To create a decorative feature

• To provide thermal protection during the conveyance of flue gases

• To reduce the height of the chimney

• To increase the velocity of the flue gases

What is the main advantage of using a flexible flue liner?

• It is made from stainless steel

• It is used to line existing chimneys

• It provides thermal protection during the conveyance of flue gases

• It is suitable for gas appliances

What document covers the application and construction of chimneys and flues?

• British Standards

• Approved Document J of the Building Regulations

• Gas Safe regulations

• Manufacturer's instructions

What test is performed to ensure that the products of combustion are evacuating the building through the flue/chimney directly to the atmosphere?

• Flue gas analysis

• Spillage test

• Flue flow test

• Visual inspection

What is the main purpose of a flue gas analyser?

• To calculate the exact concentrations of elements in the products of combustion

• To perform a visual inspection of the flue

• To measure the temperature of the flue gases

• To detect the presence of CO₂