The pressurization method when providing zoned smoke control works by creating negative pressure in the zone of the fire's origin so that the smoke does not travel beyond that zone. Tenability of the zone of the fire's origin cannot be maintained, nor is it required to be when using zoned smoke control. The pressurization method can also be provided for stair enclosures. By maintaining positive pressure within the stair enclosure, smoke is kept from entering the enclosure and thus from compromising the stair safety.