Distribution of fire extinguishers short

2. Selection and Distribution of
Fire Extinguishers

3. Selecting Extinguishers
• The size and type of portable fire
extinguisher is based on the total amount
of Class A combustible materials, the
total amount of Class B flammables, or,
for some occupancies, a combination of
both.
• For many areas, the extinguishing agent
also must be compatible with energized
electrical equipment.

4. Classification of Hazards
• Light (Low) Hazard:
• Are locations in which the total amount of
Class A combustible materials, including
furnishings, decorations, and contents, is
minor.
• These occupancies may include buildings
or rooms occupied as offices, classrooms,
assembly halls.
• Small amount of Class B flammables used
in duplicating machines, art departments,
and the like are included.

5. Ordinary (Moderate) Hazard
• Are locations in which the total amount of
Class A and Class B are present in greater
amounts than may be expected in light
hazard occupancies.
• Dining areas, mercantile shops and their
allied storage, light manufacturing
facilities, auto show rooms, parking
garages, and warehouses containing Class I
or Class II commodities.

6. Extra (High) Hazards
• Are locations in which the total amount of
Class A and Class B present in storage, in
production, or as finished products is over that
expected in ordinary hazard occupancies.
• Woodworking shops, vehicle repair areas,
aircraft and boat servicing facilities, cooking
areas, painting, dipping and coating areas, also
included is warehousing or in-process storage
of commodities other than Class I and II
commodities.

7. Distributing Extinguishers
• Extinguishers should be placed in
locations provide easy access and are
readily free from temporary blockage.
• Near normal paths of travel, near exits
and entrances.
• Mounted on walls, the operating
instructions must face outwards, and can
be removed easily.

8. Continue
• Ext. with gross weight of no more than 40
pounds (18 kgs) should be installed so that the
top of the extinguisher is not more than 5 feet
above the floor.
• Ext. more than 40 pounds (except wheeled
types) should be installed so that the top of
the extinguisher is not more than 3.5 feet
from the floor.
• In no case should the clearance between the
bottom of the extinguisher and the floor be
less than 4 inches.

10. Minimum number and rating for
Class A fires
Light (low)
hazard
occupancy
Ordinary
(Mod.)
Hazard
Extra (High)
Hazard
Min. Rated
Single Ext. 2-A 2-A 4-A
Maximum
floor area
per unit of A
3000 sq. ft. 1500 sq. ft. 1000 sq. ft.
Max. floor
area for ext.
11250 sq. ft. 11250 sq. ft. 11250 sq. ft.
Max. travel
dist. to Ext
75 ft. 75 ft. 75 ft.

11. Maximum Area Ext. Can Protect

12. Distribution of Class A Fire
Extinguishers
Max. Area to be Protected Per Ext. sq. ft. Max.
Travel
Distance
Class A
Rating
Extra
Hazard
Ord.
Hazard
Light
Hazard
----- ----- ----- 75‫قدم‬ 1A
----- 3000 6000 75‫قدم‬ 2A
----- 4500 9000 75‫قدم‬ 3A
4000 6000 11250 75‫قدم‬ 4A
6000 9000 11250 75‫قدم‬ 6A
10000 11250 11250 75‫قدم‬ 10A
11250 11250 11250 75‫قدم‬ 20A
11250 11250 11250 75‫قدم‬ 30A
11250 11250 11250 75‫قدم‬ 40A

13. Example

14. Area = 450X150 = 67500 Ft²
• From the table:
• 67500 / 11250 = 6 fire ext.
• 6 x 4A light hazard
• 6 x 10A ordinary hazard
• 6 x 20A extra hazard
• The travel distance rule (75ft) has been
violated.

15. Example

16. Area 67500 Ft²
• 67500 / 6000 = 12 fire extinguishers
• 12 x 2A light hazard
• 12 x 4A ordinary hazard
• 12 x 6A extra hazard
• In this case both distribution and travel
distance rules are fulfilled.

17. Example

18. Distribution of Class B Fire
Extinguishers -
‫الخطر‬ ‫موقع‬ ‫بين‬ ‫مسافة‬ ‫أقصى‬
‫الجهاز‬ ‫وموقع‬
‫الجهاز‬ ‫أداء‬ ‫لمعدل‬ ‫الدنى‬ ‫الحد‬ ‫المخاطر‬ ‫نوع‬
30‫قدم‬
50‫قدم‬
5B
10B
‫خفيفة‬ ‫مخاطر‬
30‫قدم‬
50‫قدم‬
10B
20B
‫عادية‬ ‫مخاطر‬
30‫قدم‬
50‫قدم‬
40B
80B
‫جسيمة‬ ‫مخاطر‬

19. Distribution for CLASS C
• Installed where there is live electrical
equipment.
• Carbon Dioxide, Dry Chemical, and Halons
• Power has cut off the fire becomes Class A
or Class B.

20. Distribution for Class D
• The amount of agent needed normally is
figured according to the surface area of the
metal plus the shape and form of the metal
which can contribute to the severity of the
fire.
• Travel distance 75 ft.

21. Classification and Ratings
Description Rating
2.5 gallon water 2A
20 lb Carbon Dioxide 10B:C
5 lb dry chemical (ammonium ph.) 2A:10B:C
10 lb dry chemical (Sod. Bicarb.) 60B:C
10 lb dry chemical (pot. Bicarb.) 80B:C
125 lb dry chemical (amm. Phosph) 40A:240B:C
33 gal. AFFF 20A:160B
5 LB HALON 1211 10B:C
9 LB HALON 1211 1A:10B:C
1.5 LB HALON 1211/1301 1B:C