A fire protection device for holding a fire extinguishing agent. The device is made from a dual-face enclosure coupled to one another through internal ribs, and is configured such that a single chamber defined by the faces and ribs is configured to contain all of the agent. The coupling between the ribs and the two panel faces promotes transfer of an energy source, such as ballistic impact, explosion or excessive temperature, to the front face to promote cracking and subsequent shattering of the front face in a brittle manner. This opening up of the front face releases the fire extinguishing agent in a thorough and well-dispersed manner.