To supersede the provision in Sentence 3.2.7.2.(1), which would otherwise permit heating appliances if they are installed in a manner that does not create a fire or explosion hazard, and specifically prohibit their presence, on the basis of the increased hazard imposed by the storage of dangerous goods classified as flammable gases.
This is to limit the probability that gases will be ignited in the event of a gas leak in the storage room, which could lead to a fire or explosion, which could lead to harm to persons.