■■Type I fire-resistive construction was originally designed to contain fire inside the building to one floor. However, there are two avenues by which fire and smoke can spread throughout a modern fire-resistive building; the central air conditioning ducts and auto-exposure, (flames extending vertically from window to window).Air ducts of a central air conditioning system penetrate every fire barrier in the modern Type I building.One of the IC’s first actions at a fire inside a fire-resistive building should be to order the air system shut down.Auto-exposure is when flames erupt out of a heat-shattered window and melt and break the glass window directly above. Once the window above is broken and falls away, flames can enter and ignite ceiling tile, curtains or furnishings. Even if the windows do not melt or break from heat, a small-concealed space between the exterior wall and the end of the floor slab can allow vertical spread of fire and smoke from floor to floor above and near a window. To combat fire spread by auto-exposure, the IC should order an aerial master stream into operation.A water stream directed against the exterior wall between the top of one window opening and the bottom of the window above can slow down fire spread.Please visit our website at www.saypro.online Email: info@saypro.online Email: info@saypro.online Call: + 27 11 071 1903 WhatsApp: + 27 84 313 7407. Comment below for any questions and feedback. For SayPro Courses, SayPro Jobs, SayPro Community Development, SayPro Products, SayPro Services, SayPro Consulting, and SayPro Advisory visit our website to www.saypro.online