It takes about seven minutes for a fire to turn an unsprinklered office into a pile of ashes. Those benign looking plastic computers burn. Desks, carpeting and the padding underneath contribute to a fire. Some materials melt or disintegrate, such as plastic laminate, vinyl-fabric, foamed plastic and wood padding.
Copier fluid has flash-fire potential.
Some things can even self-ignite given the right conditions. To answer those questions, start by taking a mental walk through your building. Then look at the jurisdictional code. Most people don't realize that building codes usually set the minimum requirements, but those only allow time for evacuating the building, not saving it. And, if the building is lost, the business could shut down, leaving personnel on the street.