What is the maximum distance allowed from the invert to the floor level for a stub stack without requiring ventilation in England and Wales?

• 1.3m

• 1.5m

• 2m

• 6m

What is the purpose of a stub stack in plumbing?

• To provide ventilation to the appliances

• To allow appliances to be connected directly to the drain

• To measure the water pressure

• To prevent water from flowing back into the appliances

How can ventilation be acquired for a stub stack if required?

• By installing a water pump

• By using a wider pipe

• By installing an air admittance valve (AAV)

• By increasing the water pressure

What is the maximum allowable distance for a single appliance to be connected to a stub stack?

• 6m

• 12m

• 1.5m

• 2m

What is the maximum distance a stub stack can be installed away from the main vented stack (branch drain)?

• 3m

• 6m

• 10m

• 12m

Where must the vented stack always be installed in relation to the run?

• At the middle part of the run

• At the lowest part of the run

• At the head or highest part of the run

• Outside the building

What is the maximum height to the highest connection from the ground floor for a stub stack installation?

• 1.0m

• 1.3m

• 2.0m

• 2.5m

What is the maximum distance from the invert to the ground floor for a stub stack installation?

• 0.9m

• 1.3m

• 1.5m

• 2.0m

When installing an Air Admittance Valve (AAV), whose instructions must be followed?

• The retailer's instructions

• The manufacturer's instructions

• The plumber's personal preference

• General industry guidelines

What is required to protect an AAV from freezing?

• Waterproof coating

• Insulation

• Heat tape

• Nothing, AAVs are freeze-proof