Nmc gltv19 fire sign, fire blanket, 12 x 9, 6 hour glow rigid plastic the location of flammable substances, fire alarms, hoses, extinguishers, blankets, and evacuation exits and routes must be clearly marked throughout your facility to not only prevent a fire, but also help ensure your employees’ safety. These fire blanket safety signs enhance the visibility of your signage with flange signs. Made from a rigid plastic for increased durability. Provides an illumination duration time of 6 hours during blackouts.