The Vulcan Vent: Your First Line of Defense From Wildfires & Embers. Vulcan Vents are designed to be fire and ember safe. An ember catching screen blocks dangerous embers during ember attacks before the fire arrives. When a wildfire nears and the vent reaches the critical temperature, the intumescent coating on the matrix structure expands, creating an insulating barrier from fire and embers. The founders at New Cal Metals, Inc. have worked closely with the inventors and chemical engineers at Firefree Coatings Inc. to bring to market this advanced vent solution. When you buy a Vulcan Vent you help your house protect itself from flame and embers. Combining our quality vents and Vulcan fire stopping honeycomb matrix core with stainless steel ember catching screen has produced unique and remarkable results.