_ Showers the greater of: - 36 m 3/h per square metre of the room’s surface area, and - 90 m 3/h per shower head, but not less than 350 m 3/h. _ Toilets and the greater of: urinals - 36 m 3/h per square metre of the room’s surface area, and - 45 m 3/h per toilet or urinal, but not less than 350 m 3/h. clothes _ hooks or lockers the greater of: for damp work 36 m 3/h per square clothes (drying metre of the room’s facilities) surface area, and 12 m 3/h per locker. _ Place Ventilation (in cubic metres of air per hour) _ Change hooks or lockers 18 m 3/h per square rooms for street clothes metre of the room’s or unsoiled work surface area.