One of the two means to obtain a degree of structural fire protection and fire safety in a building. Passive Fire Protection measures are intended to contain a fire in the fire compartment of origin, thus limiting the spread of fire and corrosive, fatal flue gases for a limited period of time, as determined by testing, which must bound the installed configuration. Examples of passive fire protection measures are walls and floors required to have a fire-resistance rating, firestops, closures and enclosures. Contrary to active fire protection measures, passive fire protection means do not typically require electric or electronic activation or a degree of motion. Exceptions to that particular rule of thumb are fire dampers and fire door closers, which must move and shut in order to work, as well as all intumescent products, which swell, thus move, in order to function. Also see active fire protection