Getting Part F floor area right for MVHR sizing

[Sparrowhawk]

Am I correct that when working out the floor area for Part F F1(1) 1.24 it requires the following?

 

1. You must include the whole area of a room in the eaves (even if the headroom is under 1m)
2. You must include the area taken up by walls
3. You should include anything inside the thermal envelope e.g. eaves storage cupboards

 

And because of the emphasis of supply of air to habitable rooms, which Part F defines as "A room used for dwelling purposes but which is not solely a kitchen, utility room, bathroom, cellar or sanitary accommodation." I exclude the floor area of our kitchen, utility room and bathrooms?

[JohnMo]

1 hour ago, Sparrowhawk said:

I exclude the floor area of our kitchen, utility room and bathrooms?

No, they are part of the habitable space and within the heated envelope.