Domestic Gas Flues/Chimneys Quiz Quiz

An appliance with a B11 flue system is described as?

• Open flued, natural draught, with fan upstream of heat exchanger.

• Open flued, fanned draught, with fan downstream of heat exchanger.

• Open flued, natural draught, with draught diverter.

• Open flued, natural draught, without draught diverter (closed flue)

Open flue, Natural draught Chimney Systems

The purpose of a draught diverter is?

• To direct any downdraught away from the combustion chamber.

• To direct carbon monoxide into the flue.

• To prevent downdraught.

• To prevent condensation from entering the appliance.

An open flued chimney should rise vertically by ………. mm before any change of direction?

• 300 mm.

• 600 mm.

• 900 mm.

• 1200 mm.

Any bends used on a chimney should not exceed?

• 35°.

• 45°.

• 60°.

• 90°.

The minimum cross sectional area of a chimney for a new gas fire is?

• 120 mm².

• 1200 mm².

• 12000 mm².

• 120000 mm².

Which size of opening within a pre-cast flue block would be unsuitable for a gas fire?

• 90 mm x 185 mm.

• 100 mm x 165 mm.

• 70 mm x 250 mm.

• 130 mm x 130 mm.

The maximum length of twin wall flue pipe to be installed externally is?

• 1 metre.

• 2 metres.

• 3 metres.

• 4 metres.

The minimum clearance from the inner part of a twin wall chimney pipe to combustible material is?

• 15 mm.

• 25 mm.

• 50 mm.

• 100 mm.

A terminal is required on a chimney outlet when the diameter is equal to or less than?

• 100 mm.

• 125 mm.

• 150 mm.

• 170 mm

What is the minimum distance that a chimney outlet should terminate above the ridge on a pitched roof?

• 250 mm.

• 600 mm.

• 1 metre.

• 1.5 metres.