Drainage power point 2 2025

In a secondary ventilated stack system, the main stack has a secondary vent, which is connected from just above the ________ going up to the dry section of the stack.

• long radius bend

• trap

• floor

• roof

Look at the diagram of the Secondary ventilated stack system. What is the name of the vertical pipe that provides additional ventilation to the system?

• Secondary ventilating stack

• Soil pipe

• Waste pipe

• Main drain

Look at the diagram of the Ventilated branch system. What is the name of the vertical pipe labeled as the main air passage for ventilation?

• Main ventilating stack

• Soil pipe

• Waste pipe

• Branch vent

In the diagram of the Ventilated branch system, which part is labeled as the horizontal pipe that carries waste water to the main discharge stack?

• Branch discharge pipe

• Vent pipe

• Main discharge stack

• Soil pipe

What is the minimum size of the branch ventilating pipe for a single appliance in a ventilated branch system?

• 20mm

• 25mm

• 32mm

• 40mm

The size of the branch ventilating pipe for multiple appliances in a ventilated branch system is _______.

• 32mm

• 25mm

• 40mm

• 50mm

According to the 'Ventilated branch system', where must any branch ventilating pipe be connected?

• To the discharge stack below the spillover level of the appliance

• To the discharge stack above the spillover level of the appliance

• Directly to the appliance

• To the main water supply

According to Building Regulations, what is the acceptable way to terminate a soil stack inside a building?

• Installing a water trap

• Installing an air admittance valve

• Installing a vent pipe

• Sealing the stack completely

What is the main purpose of an air admittance valve (AAV)?

• To allow foul air into the building

• To allow air into the stack but not allow foul air into the building

• To block all air from entering the stack

• To increase water pressure

If an air admittance valve (AAV) is situated inside boxing, there must be ______ available for maintenance.

• access

• lighting

• insulation

• ventilation