To limit the probability that the construction materials of linen chutes or refuse chutes, or services in such chutes, will contribute to the growth and spread of a fire originating in the chutes, which could lead to the spread of fire to other parts of the building, which could lead to harm to persons.
To limit the probability that a fire in the shaft will spread to the linen or refuse chute, which could lead to the growth or spread of fire, which could lead to harm to persons.