To waive the requirement for a fire separation between a dwelling unit and an attached garage as stated in Sentence 3.3.5.6.(1) on the basis that sufficient conditions are in place to minimize the threat posed by fire and exposure to vehicle exhaust fumes to the occupants of the dwelling unit, or to the occupants in other dwelling units.
This [the separation] is to limit the probability that a fire involving the garage or the dwelling unit will spread to other parts of the building, which could lead to harm to persons.
This [the door requirements, fume barrier and prohibition of air ducts] is to limit the probability that vapours will migrate from the garage into the dwelling unit, which could lead to their accumulation and subsequent ignition by a nearby ignition source, which could lead to a fire or explosion, which could lead to harm to persons.