Part L 2021 correct System and Aux. Vent System assignment for centralized balanced scenario

[harshrnaik]

Hi everyone,

I have a query regarding Part L systems input for a particular scenario for a student residential building project.

Consider a studio room & a bathroom positioned adjacent to it.

Mechanical ventilation is utilized with centralised balanced philosophy so that the studio has supply and the bathroom has extract from a single mechanical ventilation unit.

For the Part L systems, Aux. Vent system inputs;
the studio will be assigned with centralised balanced system and 'mechanical supply' will be ticked as 'Yes' with respective SFP(W/l/s).
Should the bathroom be assigned with extract?
Or should we keep it as 'None' in Vent system tab?

Asking this as I want to model this scenario correctly in Part L.
Kindly help.