To limit the probability that inappropriate design, construction or installation will lead to performance that is significantly below expectations, which could lead to the accumulation of air contaminants, which could be ignited in the presence of an ignition source, which could lead to fire or explosion, which could lead to damage to the building.
To limit the probability that the connection of exhaust ducts from laundry drying equipment to other exhaust ducts will lead to a buildup of lint in exhaust ducts in the building, which could lead to fire, which could lead to harm to persons.