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Under the action of heat, the PVC profile complete fire protection, softens as the intumescent core expands sealing the gap between the door and the door frame, through which fire and toxic gas could pass. The amount of pressure fireplug, developed by the expanding intumescent is dependent on the gap to be sealed. The wider the gap the lower the pressure.. The temperature at which Fireplug Intumescent strip fire protection materials, starts to activate is 120 - 160 oC. At this temperature no one would survive on the fireside of the door and in most cases the thermal shock would be fatal to anyone cable passthrough system suppliers, on the unexposed side opening the door. However, despite the requisite that the pressure developed by the expanding intumescent is sufficient to downlighter protection covers, keep the door closed it is possible to make the door open if required. Perfomance Fireplug IFS104 and IF104 has been tested by TRADA to British Standards ventilation grill manufacturer, BS476 Part 22, on April 20th 1993, test No. FR1687. The test criteria attained in Fireplug Intumescent Strip being acceptable for use in many leading manufacturers intumescent slabs, doors for 30/30 half hour doors, likewise Fireplug IFS104 and IF104 has been tested for use on 60/60 one hour doors. Application Fireplug IFS104 and IF104 is fitted into a groove nominally 10mm wide x 4mm deep. To aid fixing, although not essential, the strip can have a self adhesive backing, alternatives to this are gluing or securing with tacks. intumescent pillows, IFS104 and IF104 are fixed similarly but the groove is nominally 20mm wide x 4mm deep. The groove can be routed into either the door or into the door frame. The rout is along the head of the door and down the jamb. Intumescent is not required along the bottom as in a fire situation a negative pressure results making the air flow in the opposite cable tray blocks, direction to the top. Where the groove is masked by hinges, locks or other door ironmongery we recommend that FIreplug Intumescent Strip is used in conjunction with Fireplug Hinge and Lock Protection. If a smoke seal is required then the Fireplug IFS Profile can be used. The recommended gap around the door is 4mm, this enables ease of opening, fire protection boards and closing against the brush stroke seal. Various single and double door types are shown under their relevant intumescent strip requirements. Various nozzles are capable of projecting solid, heavy streams of water, curtains of spray, or fog. Fire trucks carry a selection of nozzles, which are used according to the amount of heat that must be absorbed. Nozzles can apply water in the form of streams, spray, or fog at rates of flow between 57 litres (15 gal) to more than 380 litres (more than 100 gal) per minute. Straight streams of water have greater reach and penetration, but fog absorbs heat more quickly because the water droplets present a greater surface area and distribute the water more widely. Fog nozzles may be used to disperse vapours from flammable liquids, although foam is generally used to extinguish fires in flammable liquids. Water Additives A variety of chemicals may be added to water to improve its ability to extinguish fires. Wetting agents added to water can reduce its surface tension. This makes the water more penetrating and facilitates the formation of small drops necessary for rapid heat absorption. By adding foam-producing chemicals and liquids to water, a fire-blanketing foam is produced. Foam is used to extinguish fires in combustible liquids, such as oil, petroleum, and tar, and for fighting fires at airports, refineries, and petroleum distribution facilities. A chemical additive can expand the volume of foam 1,000 times. This high-expansion foam-water solution is useful in fighting fires in basements and other difficult-to-reach areas because the fire can be smothered quickly with relatively little water damage. Salvage This term refers to the methods by which fire fighters protect merchandise, household goods, and the interiors of buildings from smoke and water damage. Objects are covered with waterproof covers, and water is removed by water vacuums, mops, squeegees, water chutes, and portable pumps. Almost all fire departments carry salvage equipment in their apparatus. Fire departments in some large cities maintain special salvage companies.
