6.1 The ventilation requirements of a space containing
a LPG appliance should be assessed against an appropriate standard
(e.g. Annex B of ISO 10239) and should take into account gas burning
equipment and persons occupying that space.
6.2 Where ventilators required for LPG appliances
in intermittent use can be closed, there should be appropriate signs
at the appliance warning of the need to have those ventilators open
before the appliance is used.