Wildfire: Vulnerability of Vents to Wind-Blown Embers

Wildfire embers landing on or near a building can result in ignition of a home or business. Embers can ignite combustible material directly and can also cause spot fires capable of igniting a building. If enough embers are able to enter the building through a vent or open window, they can ignite materials inside the building. An ember that gets inside an attic or crawl space could ignite items stored in those locations, such as newspapers and cardboard boxes. This reports adds to a growing body of literature on how buildings can be ignited by wind-blown embers by focusing on the vulnerability of vents to embers. Ember entry through vents can result in ignition of combustible materials in the attic, and result in a building burning from the inside out.