What is the maximum distance from the invert level of the drain to the highest waste connection for an unventilated stub stack?

• 1 m

• 1.5 m

• 2 m

• 2.5 m

What is the maximum vertical drop to the invert level of the drain from floor level for an unventilated stub stack?

• 1 m

• 1.3 m

• 1.5 m

• 2 m

What is the purpose of an unventilated stub stack terminated with an access fitting?

• To connect a group of ground floor appliances to the building drain

• To ventilate the building drain

• To increase water pressure in the building

• To reduce noise from the plumbing system

For what type of sanitary pipework systems is the air admittance valve suitable?

• Systems up to five storeys high

• Systems up to ten storeys high

• Systems up to fifteen storeys high

• Systems up to twenty storeys high

In what position must the air admittance valve be fitted?

• Horizontal position above the flood level

• Vertical position above the flood level

• Horizontal position below the flood level

• Vertical position below the flood level

Where should the air admittance valve be installed within the building?

• In a non-ventilated duct

• In a ventilated duct, compartment, or roof space

• In a non-ventilated compartment

• In a non-ventilated roof space

What is a critical condition to avoid when installing the air admittance valve?

• Risk of overheating

• Risk of freezing

• Risk of overpressure

• Risk of flooding

Why must the air admittance valve be accessible?

• For easy replacement

• For aesthetic purposes

• For inspection and testing

• For noise reduction

What happens to the air admittance valve when the system is subject to negative pressure?

• The valve remains closed.

• The diaphragm will lift and allow air to be drawn into the system.

• The valve will open and release foul air.

• The valve will remain open.

What ensures that the air admittance valve remains closed and prevents foul air from escaping the system?

• Negative pressure

• High temperature

• Positive pressure

• Low temperature