WAC 51-11C-40245
WAC 51-11C-40245. Section C402.5.7 — Air intakes, exhaust openings, stairways and shafts
C402.5.7 Air intakes, exhaust openings, stairways and shafts. Stairway enclosures, elevator shaft vents and other outdoor air intakes and exhaust openings integral to the building envelope shall be provided with dampers in accordance with Section C403.7.8.