ABSTRACT
REQUIREMENTS OF THE APPROVED DOCUMENTS Approved Document F makes very specific requirements with regard to habitable rooms, kitchens, bathrooms and WCs:
(a) A habitable room shall have window openings of 5% of the floor area of the room and a trickle ventilator of 8000 mm2. Where one room obtains its ventilation via another room (it has no windows of its own) the opening between them must be at least 5% of the floor area of both rooms combined and the room with the window or door in it also has an opening equal in area to 5% of the floor area both rooms combined and trickle ventilation not less than 8000 mm2 (see Diagram 2 on page 7 of Approved Document F).
