Multiple Choice Questions – Chapter 4: Ventilation

Why is clean air supply essential for gas appliances?

• To reduce noise

• To prevent corrosion

• For combustion and occupant safety

• To cool the appliance

What is the ratio used to convert gross heat input to net for Natural Gas?

• 1:1.5

• 1:1.2

• 1:1.1

• 1:1.3

What is adventitious ventilation?

• Mechanical ventilation

• Air leakage through structural defects

• Air supplied by fans

• Air from ducted systems

What is the adventitious ventilation allowance for open flue appliances?

• 50 cm²

• 35 cm²

• 25 cm²

• 70 cm²

What is the required ventilation per kW for open flue appliances?

• 10 cm²

• 7 cm²

• 5 cm²

• 3 cm²

What is the minimum opening size for vent grilles?

• 3 mm

• 5 mm

• 10 mm

• 15 mm

What is the purpose of intumescent air vents?

• Reduce noise

• Prevent fire spread

• Increase airflow

• Filter air

What is passive stack ventilation used for?

• Heating

• Moisture and odour removal

• Cooling

• Combustion air

What is the minimum duct diameter for PSV systems?

• 100 mm

• 125 mm

• 150 mm

• 200 mm

What is the minimum separation distance for vents from flue terminals for appliances <7 kW?

• 100 mm

• 200 mm

• 300 mm

• 500 mm