A Gas appliance with a natural draught open flue incorporating a draught diverter and natural draught burner would be catergorised as which type of appliance?

• b11.

• b14.

• b21.

• c11.

Which of the following open flues do not necessarily need a terminal fitted when a gas fire is to be installed?

• A chimney with 225mm salt glaze lining.

• A chimney with a 125mm Flexible flue liner.

• A pre-cast Flue with 125mm twin wall flue termination.

• A flue box with 150mm twin wall flue pipe.

When shall the fitting of a bird guard to a chimney be considered?

• Where trees are close to the flue terminal.

• Where no terminal is fitted.

• Where the flue terminal is below two meters.

• where there is known to be a problem of birds nesting

If a restrictor is found in the throat of a brick chimney when a gas fire is fitted:

• It must be removed.

• it must be permanently fixed in the open position.

• The Fire must only be below 7kw.

• A gas fire is not allowed with this type of flue.

A natural draught balanced flue of a 20kw boiler must terminate at least how far from the bottom of a openable window?

• 300mm.

• 600mm.

• 1200mm.

• 1500mm.

When double wall flue pipes are run externally ist is important, in order to prevent condensation, to ensure the fue lenght does not exceed:

• 12m.

• 20m.

• 28m.

• 33m.

The minimum cross sectional area of a new flue block system for a gas fire must be:

• 12000mm² with no dimension less than 75mm.

• 12000mm² with no dimension less than 90mm.

• 16500mm² with no dimension less than 75mm.

• 16500mm² with no dimension less than 90mm.

when a natural draught open flue terminates through a roof with an unobstructed pitch, the terminal must :

• Be at least 600mm vertically from the roof.

• Beat least 1000mm vertically from the roof.

• Be at least 1000mm horizontally from the roof.

• Be at least 1500mm horizontally from the roof.

Which of the following need not be incorporated into the design of appliances fitted to a shared open flue?

• A draught Diverter.

• A flame supervision device.

• An atmosphere sensing device.

• A pressure regulator.

Which of the following is not a function of the draught diverter of an open flue?

• break the pull of the secondary flue,

• Dilute products of combustion.

• Prevent down draught.

• Divert down draught.