Chapter 9: Means for Fighting Fire
290. A small fire tackled with fire-fighting equipment in the early stages may be prevented from developing into a fire of life-threatening proportions. Fire-fighting equipment can fall into one of two categories; either (a) it is designed for use by persons, such as portable fire extinguishers or (b) it is a fixed installation, such as a sprinkler system which comes into operation automatically in the event of fire.
Automatic Life Safety FireSuppression
291. An automatic life safety fire suppression system operates automatically on detection of an outbreak of fire within the building. In the case of a conventional sprinkler system, water is discharged from the individual head which has detected heat from the fire, all other discharge heads remain closed unless similarly affected by heat. An automatic life safety fire suppression system can be effective in controlling a fire and limiting fire growth.
292. Where buildings are fitted with a smoke and heat exhaust ventilation system, sprinklers are usually installed to restrict fire size.
293. Fire suppression should be appropriate to the occupancy and should be determined on the basis of risk. Design and installation rules for automatic life safety sprinkler systems are contained in BS 9251 or BS EN 12845.
294. Water mist systems are bespoke systems designed on the basis of established test performance. Design guidance is contained in BS 8458 or BS 8489.
295. Many suppression systems are third party certificated which helps to assure their quality.
Fire-fighting Equipment for Use by Persons
296. The safe use of an appropriate fire extinguisher to control a fire in its early stages can reduce the risk to people in the premises. However, tackling a fire with a portable extinguisher should not be undertaken at the expense of ensuring the Fire and Rescue Service has been called, or the commencement of evacuation.
297. The provision of fire extinguishers will depend on the circumstances within and the size of individual premises and the presence of staff who can be trained in their use. Portable extinguishers should be simple to operate, readily accessible, within the handling capabilities of staff or the persons who may use them and be suitable for the classes of fire anticipated (see Table 8). Extinguishers are described by their extinguishing capacity. They are marked with a letter and a number: the letter denotes the class of fire, the number denotes the fire size extinguishing capability. An extinguisher could for example have a rating such as '13A' or '55B'.
298. Information on the selection and installation of fire extinguishers is contained in BS 5306: Part 8. A guide to the level of provision of class A extinguishers is obtained by multiplying the floor area of a storey by 0.065. For example, a floor area of 400 m2 would have a rating of 26A (400 x 0.065 = 26) which is the total value of class A extinguisher and can be achieved by combinations of extinguishers with different ratings to achieve the total value. Where there are other classes of fire, appropriate extinguishers for these may be necessary.
299. In small premises, having one or two portable fire extinguishers of an appropriate type and readily available for use may be all that is necessary. In small unstaffed HMOs a fire blanket in the kitchen may be all that is necessary.
300. Fire extinguishers are positioned on escape routes, close to room or storey exits, final exits from the building or, if necessary, adjacent to hazards. They may be placed on a stand or hung on a wall at a convenient height so that they can be easily lifted off. Generally no one should have to travel more than 30 m to reach a fire extinguisher. It is good practice to group extinguishers together in fire points at a similar position on each floor.
301. While permanent hose reels can provide an effective fire-fighting facility when used by trained personnel, there are disadvantages. When deployed, a hose reel may prevent doors from fully closing causing the spread of smoke, and the hose may pose an obstacle to the movement or escape of occupants.
302. A fire blanket may be appropriate. It may be used to smother a small fire involving cooking oil or fat. Where a kitchen provides meals on a scale larger than a normal domestic household, a heavy duty fire blanket may be appropriate.
Table 8 - Extinguisher types
Water Extinguisher - Red body
Suitable for Class A fires (fires involving solid materials such as wood, paper or textiles) but not suitable for use on live electrical equipment because water is a conductor of electricity
Water Extinguisher with Additives - Red body
Suitable for Class A fires. Some also suitable for Class B fires (fires involving flammable liquids such as petrol, diesel or oils) if so indicated on the extinguisher
Foam Extinguisher - Red body with cream label/band
- Suitable for Class A or B fires and particularly suited to extinguishing liquid fires
- Should not be used on free-flowing liquid fires unless the operator has been specially trained
- Not suitable for deep-fat fryers or chip pans
Powder Extinguisher - Red body with blue label/band
- Suitable for most classes of fire
- Can be used on fires involving electrical equipment but may damage the equipment
- Since powder does not cool a fire appreciably, the fire may re-ignite
- No longer generally recommended for use indoors. May cause reduction in visibility and impair breathing if used within buildings
Carbon Dioxide (CO2) Extinguisher - Red body with black label/band
- Suitable for Class B fires and particularly suitable for fires involving electrical equipment as it is a non-conductor
- Since CO2 does not cool a fire appreciably, the fire may re-ignite
Wet Chemical Extinguisher - Red with canary yellow label/band
Suitable for Class F Fires (fires involving cooking oils such as in deep-fat fryers)
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