SBCoFD Truck Company Operations: Vertical Ventilation When you see firefighters on the roof of a burning building, it’s not random or reckless, it’s a coordinated operation. Vertical ventilation is a critical tactic between Interior and Roof Divisions working in sync. While interior crews advance to locate and suppress the fire, truck company crews on the roof are cutting ventilation openings to release superheated smoke and gases. This coordination reduces interior temperatures, limits flashove