Domestic Gas Ventilation Quiz

When converting Gross heat input to net heat input you must?

• Multiply by 1.11.

• Divide by 1.11.

• Divide by 1.09.

• Multiply by 1.08.

What is the equivalent net kW figure for adventitious air?

• 14 kW.

• 28 kW.

• 1.11 kW.

• 7 kW.

When calculating compartment ventilation we must not make any allowances for?

• For low level ventilation.

• For high level ventilation.

• For adventitious ventilation.

• All of the above.

What is the smallest size of opening allowed in a vent used for supplying combustion air?

• 5 mm.

• 6 mm.

• 9 mm.

• 10 mm.

Vents supplying combustion air to a gas fired appliance passing through a cavity wall must be?

• At least 100 mm2 cross sectional area.

• Sleeved/ducted throughout the width of the wall.

• Painted yellow ochre to identify it as a gas vent.

• At least 50% larger than the actual requirement.

If a gas cooker requires ventilation it must be?

• Provided at high and low levels within the same room as the cooker.

• Sized in accordance the manufacturer's instructions or BS 5440-2.

• Provided indirectly so as to reduce draughts.

• Sized in accordance with BS 5440-1.

When determining the ventilation requirements for an open flued gas appliance within a room, it is derived from?

• Heat input gross - 7 x 5 (cm²/kW).

• Heat input net - 7 x 4.5 (cm²/kW).

• Heat input net - 7 x 5 (cm²/kW).

• Heat input gross - 7 x 4.5 (cm²/kW).

Calculate the ventilation for an open flued gas boiler of 22.2 kW gross within a room venting direct to the outside?

• 65 cm2.

• 68.47 cm2.

• 100 cm2.

• 111 cm.2

Wherever there are two or more internal vents in series, the free area of each internal vent shall be increased by?

• 100 cm2.

• 50 cm2.

• 50%.

• 10%.

Calculate the compartment ventilation for a 22 kW net heat input open flued boiler where the compartment is vented into a room?

• High 220 cm2 - Low 440 cm2.

• High 220 cm2 - Low 220 cm2.

• High 110 cm2 - Low 220 cm2.

• High 150 cm2 - Low 300 cm2.