DEPARTMENT OF LICENSING AND REGULATORY AFFAIRS  
DIRECTOR’S OFFICE  
GENERAL INDUSTRY SAFETY STANDARDS  
(By authority conferred on the director of the department of licensing and regulatory  
affairs by sections 16 and 21 of 1974 PA 154, and Executive Reorganization Order Nos.  
1996-2, 2003-1, 2008-4, and 2011-4, MCL 445.2001, 445,2011, 445.2025, and 445.2030)  
PART 8. PORTABLE FIRE EXTINGUISHERS  
R 408.10801. Scope.  
Rule 801. (1) The rules of this part apply to the installation, use, inspection,  
maintenance and testing of portable fire extinguishers in, around and about places of  
employment. The provisions of this part are the minimum requirements for portable fire  
extinguishers. A specific rule may be set forth in other general industry safety standards  
where, due to process hazards, additional portable fire extinguishers may be required.  
(2) Where the employer has established and implemented a written fire safety policy  
which requires the immediate and total evacuation of employees from the workplace  
upon the sounding of a fire alarm signal and which includes an emergency action plan  
and a fire prevention plan which meet the requirements of General Industry Safety  
Standard Part 6 “Fire Exits,” R 408.10623 and R 408.10624 respectively, and when  
extinguishers are not available in the workplace, the employer is exempt from all  
requirements of this standard unless a specific General Industry standard requires that a  
portable fire extinguisher be provided.  
History: 1979 AC; 1984 AACS; 2013 AACS.  
R 408.10803 Definitions; A to C.  
Rule 803. (1) "Approved label" means a label or other identifying mark of a  
nationally recognized testing laboratory  
such  
as  
underwriters' laboratories,  
incorporated, factory mutual research corporation, or underwriters' laboratories of  
Canada that maintains a periodic inspection of production of labeled fire equipment or  
materials and by whose labeling is indicated compliance with nationally recognized  
standards or tests to determine suitable usage in a specified manner.  
(2) "Class "A" fire" means a fire that has as its fuel ordinary combustible  
material such as wood, cloth, paper, rubber, and many plastics.  
(3) "Class "B" fire" means a fire that has as its fuel flammable liquids, gases,  
or greases.  
(4) "Class "C" fire" means a fire that involves energized electrical  
equipment where the nonconductivity of the extinguishing agent is necessary to prevent  
shock. The fuel consumed by a class "C" fire will be classed as A, B, or D.  
Page 1  
(5) "Class "D" fire' means a fire that involves the  
combustible metals such as magnesium, titanium, zirconium, sodium, or potassium.  
(6) "Class "K" fire" means fire in cooking appliances that involve  
oxidation  
reaction of  
a
combustible vegetable or animal oils and fats.  
History: 1979 AC; 2006 AACS.  
R 408.10804 Definitions; E to I.  
Rule 804. (1) "Extinguisher" means a portable fire extinguisher.  
(2) "High hazard" means a condition where the amount of combustibles or  
flammable liquids present is such that a fire of severe magnitude may be expected.  
These may include woodworking, auto repair, aircraft servicing, warehouses with high  
piled (over 15 feet in solid piles, over 12 feet in piles that contain horizontal channels)  
combustibles and processes such as flammable liquid handling, painting, and dipping.  
(3) "Inspection" means a check to see if an extinguisher is in its designated  
place with no obvious damage or defects that would prevent operation.  
History: 1979 AC.  
R 408.10805 Definitions; L to O.  
Rule 805. (1) "Low hazard" means a condition where combustible or  
flammable liquids would create a beginning fire of minimal intensity in occupancies  
such as, but not limited to, offices, schools exclusive of trade schools and shops, and  
public buildings.  
(2) "Ordinary hazard" means a condition where combustibles would create a  
beginning fire of average or medium intensity in occupancies such as, but not limited  
to, department stores, warehouses, and manufacturing buildings of average hazard.  
History: 1979 AC.  
R 408.10807. Obtaining referenced standards.  
Rule 807. (1) The following referenced standards are available for review at the  
offices of the Michigan Department of Licensing and Regulatory Affairs, MIOSHA  
Standards Section, 7150 Harris Drive, Lansing, Michigan 48909-8143, and are available  
as follows:  
(a) The Code of Federal Regulations, Title 49, Transportation, Volume 2, Chapter I,  
Parts 100 to 177 stock number: 869-074-00212-1 and The Code of Federal Regulations,  
Title 49, Transportation, Volume 3, Chapter I, Parts 178 to 199 stock number: 869-074-  
00213-9, may be obtained from the U.S. Government Printing Office, Washington DC,  
20402; telephone number: 888-293-6498; or via the internet at website:  
each.  
(b) The following Michigan occupational safety and health standards are referenced  
in these rules. Up to 5 copies of these standards may be obtained at no charge from the  
Page 2  
Michigan Department of Licensing and Regulatory Affairs, MIOSHA Standards Section,  
7150 Harris Drive, P.O. Box 30643, Lansing, Michigan, 48909-8143 or via the internet at  
of the time of adoption of these rules, is 4 cents per page.  
(i) General industry safety standard part 9 “Fixed Fire Equipment,” R 408.10901 to  
R 408.10999.  
(ii) General industry safety standard part 6“Fire Exits,” R 408.10601 to R  
408.10697.  
History: 2006 AACS; 2013 AACS.  
R 408.10808 Employers' responsibilities.  
Rule 808. (1) An employer in control of a property where extinguishers are  
required shall be responsible for compliance with this part.  
(2) A portable extinguisher shall be maintained in a fully charged and operable  
condition and kept at its designated place ready for use, except as prescribed in R  
408.10839.  
History: 1979 AC.  
IDENTIFICATION  
R 408.10811 Classification.  
Rule 811. (1) An extinguisher shall be classified by suitability for a class of fire  
as defined in R 408.10803 and rated for extinguishing capability.  
(2) The classification shall consist of a letter which indicates the class of fire on  
which the extinguisher has been found effective, preceded by a rating numeral, for class  
"A" and "B" only, which rates the extinguishing potential of the extinguisher. See tables  
3 and 4.  
History: 1979 AC; 2006 AACS.  
R 408.10812 Labels.  
Rule 812. (1) A new extinguisher shall bear an approved label indicating its class  
and rating.  
(2) An extinguisher effective on more than 1 class of fire shall have multiple  
letter and numeral-letter classifications and ratings.  
History: 1979 AC.  
R 408.10813. Classes of fire; type and contents of extinguisher.  
Page 3  
Rule 813. (1) An extinguisher shall be selected and provided for protection  
against a specific class or classes of fire in accordance with table 1.  
(2) Table 1 reads as follows:  
Table 1  
HAZARD  
Class “A” fire  
EXTINGUISHER TYPE AND CONTENTS  
Foam, loaded stream, multipurpose dry chemical,  
pressure-operated water, water pump tanks.  
Class “B” fire  
Class “C” fire  
Class “D” fire  
Class “K” fire  
Carbon dioxide, dry chemical, foam, loaded stream,  
multipurpose dry chemical, bromotrifluoromethane.  
Carbon dioxide with plastic horn only, dry chemical,  
multipurpose dry chemical, bromotrifluoromethane.  
Extinguishing agent listed for use on a specific  
combustible metal hazard.  
Potassium acetate, potassium carbonate, potassium  
citrate, or a combination of these chemicals mixed with  
water.  
(3) Soldered or riveted shell self-generating soda acid or self-generating  
foam or gas cartridge water-type portable fire extinguishers which are operated  
by inverting the  
extinguisher  
to rupture the cartridge or to initiate an  
uncontrollable  
pressure generating chemical reaction to expel the agent shall be  
removed from service on the effective date of this part.  
History: 1979 AC; 1980 AACS; 1984 AACS; 2006 AACS.  
R 408.10814 Vapor toxicity.  
Rule 814. (1) An extinguisher or extinguishing device containing an active  
agent or propellant whose thermal decomposition produce or products have a level of  
vapor toxicity equal to or greater than any of the materials listed in table 2 shall  
not be used, installed for use, or allowed to remain installed for use.  
(2) Table 2 reads as follows:  
Figure for 408.10814  
Page 4  
History: 1979 AC; 1980 AACS.  
DISTRIBUTION  
R 408.10821 Number and classes.  
Rule 821. The number and classes of extinguishers needed shall be based on the  
area of the building or occupancy, the severity of the hazard and the anticipated classes  
of fire.  
History: 1979 AC.  
R 408.10822 Class "A" extinguishers.  
Rule 822. (1) The number of class "A" fire extinguishers required shall be in  
accordance with table 3.  
(2) Travel distance to the nearest extinguisher shall not be more than 75 feet.  
(3) A class "A" extinguisher shall be provided for  
a
combustible building,  
interior finish and contents having class "A" fire potential in accordance with table 3.  
(4) A combustible building having an occupancy hazard subject to class "B" or "C"  
fires shall have the required class "A" extinguishers in addition to class "B" or "C"  
extinguishers except that if the fire extinguisher has more than 1 letter classification,  
it may be considered to satisfy the requirements of both classifications.  
(5) A class "A" extinguisher shall be located on the same floor as the hazard.  
(6) A floor area of a building less than that specified in table 3 shall have at least 1  
class "A" extinguisher of the minimum size.  
(7) The requirements of table 3 may be fulfilled by  
extinguishers  
of lower  
ratings whose numerical ratings are equal to or exceed the minimum rating for the  
area specified, except that an extinguisher with a rating of less than "2A" shall not be  
acceptable.  
Page 5  
(8) Protection requirements shall be considered fulfilled if extinguishers of a higher  
rating are provided and the travel distance does not exceed 75 feet.  
(9) Within a location where an approved automatic sprinkler system is  
provided, the square feet area limitation prescribed in table 3 shall not apply for the  
protection requirements of class "A" extinguishers. The 75 feet travel distance to an  
extinguisher shall not be exceeded.  
(10) The employer may use uniformly spaced standpipe and hose systems or  
sprinkler system hose stations where installed for emergency use by employees  
instead of class "A" portable fire extinguishers if such systems meet the requirements  
as prescribed in general industry safety standard, Part 9. Fixed Fire Equipment, being  
R 408.10921 to R 408.10937.  
(11) Table 3 reads as follows:  
Figure for 408.10822  
Page 6  
History: 1979 AC; 1980 AACS; 1984 AACS; 2006 AACS.  
R 408.10823. Class “B” extinguishers.  
Rule 823. (1) A class “B” extinguisher shall be provided according to the severity of  
the hazard listed in table 4, except as required by subrule (3) of this rule.  
(2) A foam extinguisher only of a lower rating, not to exceed 3, may be used to  
fulfill this rule.  
(3) An open tank in a building having flammable liquids in depth exceeding 1/4 inch  
shall be provided with an extinguisher on a basis of 1 numerical unit of class “B”  
extinguishing agent per square foot of the surface area of the largest tank hazard within  
the area. An open tank in a building having an area of more than 100 square feet shall be  
provided with a fixed extinguishing system in addition to the required portable units. An  
open tank in a building having an area of more than 100 square feet and protected by a  
fixed system shall be provided with portable units to protect an area to a maximum of 100  
square feet.  
(4) Travel distance to the nearest class “B” extinguisher in a building shall be not  
more than 50 feet. A class “B” extinguisher of a higher rating may be used but the travel  
distance shall be not more than 50 feet.  
(5) Widely separated hazards, such as, but not limited to kitchens, boiler rooms, and  
paint storage rooms shall be protected with an extinguisher for the type of hazard present,  
if the travel distance exceeds 25 feet.  
(6) Table 4 reads as follows:  
Table 4  
(For Extinguishers labeled prior to June 1, 1969)  
BASIC MINIMUM  
TYPE OF HAZARD  
EXTINGUISHER  
RATING  
LIGHT  
4B  
ORDINARY  
EXTRA  
8B  
12B  
(For Extinguishers labeled after June 1, 1969)  
BASIC MINIMUM  
TYPE OF HAZARD  
EXTINGUISHER  
RATING  
5B  
LIGHT  
10B  
10B  
20B  
ORDINARY  
Page 7  
20B  
40B  
EXTRA  
History: 1979 AC; 1980 AACS; 2013 MR 1, Eff. Jan. 24, 2013.  
R 408.10824 Class C extinguishers.  
Rule 824. At least one 15 pound CO2 or equivalent class C extinguisher, as listed in  
table 1, shall be provided within 25 feet of a high hazard area containing an electrical  
distribution source including, but not limited to, a generator, transformer bank, or main  
switch gear immediately downstream from a service entrance. Since fire itself is a class  
A or B hazard, the extinguisher shall be sized and located according to the  
anticipated class A or B fire.  
History: 1979 AC.  
R 408.10825 Class D extinguishers.  
Rule 825. (1) A class D extinguisher shall be used on the specific combustible  
metal fire for which it has been approved. The extinguisher shall be used according to  
instructions on the nameplate.  
(2) A class D extinguishing agent in a quantity sufficient to provide a smothering  
blanket over the burning material shall be maintained within 25 feet of a combustible  
metal being machined or processed.  
(3) The extinguishing agent may be applied directly from a bulk container.  
History: 1979 AC.  
R 408.10826 Class "K" extinguishers.  
Rule 826. (1) A class 'K' extinguisher shall be provided for hazards where there is a  
potential for fires involving combustible vegetable or animal oils and fats.  
(2) A placard shall be conspicuously placed near the extinguisher that states that  
the fire protection system shall be activated before using the fire extinguisher.  
(3) A class "K" extinguisher shall be maintained within 30 feet (9.15 m) from the  
hazards.  
(4) Class "K" fire extinguishers manufactured after January 1, 2002, shall not be  
equipped with "extended wand-type" discharge devices.  
(5) Existing dry chemical extinguishers without a Class "K" listing that were  
installed for the protection of Class "K" hazards shall be replaced with an extinguisher  
having Class "K" listing when the dry chemical extinguishers become due for either a 6-  
year maintenance or hydrostatic test.  
History: 2006 AACS.  
INSTALLATION, INSPECTION, TESTING, AND MAINTENANCE  
Page 8  
R 408.10831 Location.  
Rule 831. (1) An extinguisher shall be located where it will be readily seen and  
accessible along normal paths of travel.  
(2) In a location where a visual obstruction cannot be avoided, a sign, color  
symbol, or other means shall be used to indicate the location.  
(3) Extinguishers of different classes grouped together shall be marked in a manner  
to facilitate proper choice in case of a fire. An extinguisher with an extinguishing agent  
which conducts electricity shall bear a label "not for electrical fires" with the letters  
legible from a distance of 3 feet or more.  
History: 1979 AC.  
R 408.10833 Installation.  
Rule 833. (1) An extinguisher shall be installed securely on a hanger, in a bracket  
or mounted in a cabinet unless it is wheeled type or cart mounted. A means shall be used  
to indicate the location of an extinguisher mounted in a cabinet or on a shelf. The  
extinguisher shall be placed so that the operating instructions face outward.  
(2) An extinguisher having a gross weight of not more than 40 pounds shall be  
installed so that the top is not more than 5 feet above the floor. An extinguisher  
having a gross weight of more than 40 pounds, except a wheeled type or cart mounted  
extinguisher, shall be installed so that the top is not more than 3 1/2 feet above the floor.  
An extinguisher, except a wheeled type or cart mounted extinguisher, shall be installed  
so that the bottom is not less than 4 inches from the floor.  
(3) An extinguisher shall be suitable for use within a temperature range of not less  
than plus 40 degrees to plus 120 degrees Fahrenheit. An extinguisher installed at a  
location subjected to temperature extremes shall be of a type listed for the temperature to  
which it will be exposed or shall be placed in an enclosure capable of maintaining the  
temperature.  
History: 1979 AC; 1980 AACS; 2006 AACS.  
R 408.10835 Inspection; maintenance or recharge date tag; replacement;  
maintenance of dry chemical extinguishers.  
Rule 835. (1) An extinguisher or hose, as prescribed in R 408.10822, shall be  
inspected monthly or at more frequent intervals when circumstances require to  
ensure that the extinguisher or hose complies with all of the following provisions:  
(a) Is at its designated place.  
(b) Has not been actuated or tampered with.  
(c) Does not have obvious damage, such as, but not limited to, physical damage,  
external corrosion, or other impairment.  
(2) An extinguisher showing defects which would possibly affect its operation  
shall be removed from service and given a complete check. An extinguisher shall  
Page 9  
have a tag attached to it showing the maintenance or recharge date and the initials or  
signature of the person who performed the service.  
(3) An extinguisher shall receive a thorough inspection at least once a year to  
insure operability. An extinguisher requiring recharging or weighing shall be  
maintained at least annually.  
(4) An extinguisher showing evidence of corrosion or mechanical injury shall be  
subjected to an approved hydrostatic test as specified in R 408.10836(2) or shall be  
replaced. A pump-type water or antifreeze extinguisher or a nonrefillable container  
showing evidence of corrosion or mechanical injury shall be replaced.  
(5) Stored pressure dry chemical extinguishers that require a 12-year hydrostatic  
test shall be emptied every 6 years in compliance with applicable maintenance  
procedures. When recharging or hydrostatic testing is performed, the 6-year requirement  
shall begin from that date. Dry chemical extinguishers having a nonrefillable  
disposable container are exempt from this requirement.  
History: 1979 AC; 1984 AACS.  
R 408.10836. Testing.  
Rule 836. (1) An extinguisher shall receive an approved hydrostatic test every 5  
years, except for dry chemical extinguishers with brazed brass, aluminum, or mild  
steel shells; bromotrifluoromethane extinguishers; and dry powder extinguishers for  
metal fires, which shall be tested every 12 years. The hydrostatic test date shall be  
recorded on a suitable metallized decal or equally durable material which has been  
affixed by a heatless process to the shell of the extinguisher and which shows the date  
of the test, test pressure, and the name of the person or agency making the test.  
An extinguisher tested after July 5, 1974, shall have a label which will not retain its  
original condition when removal from an extinguisher is attempted. An extinguisher  
manufactured under the Untied States department of transportation specifications  
incorporated in subrule (2) of this rule may have the inspection date and the  
serviceman's or firm's name, initials, or symbol stamped into the cylinder.  
(2) An extinguisher, cylinder, or cartridge used for storage of a compressed gas,  
manufactured as prescribed by United States department of transportation specifications,  
shall be hydrostatically tested in accordance with the United States department of  
transportation regulations prescribed in 49 C.F.R. Part 179 to 190, 2004 edition, which  
are incorporated herein by reference.  
(3) A nitrogen cylinder or other cylinder for inert gas, such as on a wheeled  
extinguisher, shall be tested at not less than 5 year intervals.  
(4) The hose and couplings on an extinguisher equipped with a shut-off nozzle at the  
outlet end of the hose shall have a hydrostatic test interval prescribed for the unit on  
which the hose is installed.  
(5) A dry chemical and dry powder hose assembly requiring a hydrostatic test shall  
be at a test pressure of 300 pounds per square inch for 1 minute. A carbon dioxide hose  
assembly requiring a hydrostatic test shall be at a test pressure of 1,250 pounds per  
square inch for 1 minute. Such hoses shall be tested within a protective cage.  
Page 10  
(6) An extinguisher subjected to an original factory test pressure of 350 pounds per  
square inch or more shall be tested at 75% of the factory test pressure, but not less than  
300 pounds per square inch (see table 5).  
(7) Table 5 reads as follows:  
Table 5  
Hydrostatic Test Pressure Requirements – Non-ICC Shells  
Shells Not Specified in U.S. Department of Transportation Regulations  
EXTINGUISHER TYPE  
ORIGINAL  
REQUIRES  
FACTORY TEST  
PRESSURE  
HYDROSTATIC TEST  
PRESSURE  
All Dry Chemical  
and Dry Powder  
400 psi or greater  
75% of factory  
test pressure  
350-399 psi  
300 psi  
below 350 psi  
75% of factory test  
pressure  
Foam – 500 psi  
factory test  
500  
350  
375  
Foam – 350 psi  
factory test  
300  
Stored-Pressure  
or Cartridge-Operated  
Water-Type  
(including  
Anti-Freeze  
and Loaded-Stream)  
400 psi or greater  
350-399 psi  
below 350  
75% of factory test pressure  
300 psi 75% of factory  
test pressure  
History: 1979 AC; 1980 AACS; 1984 AACS; 2006 AACS.  
R 408.10837 Recharging.  
Page 11  
Rule 837. An employer maintaining his own extinguisher shall use recharging  
materials of the class specified on the extinguisher nameplate or recommended by the  
manufacturer for recharging.  
History: 1979 AC.  
R 408.10839 Removal and return of extinguishers.  
Rule 839. An employer shall assure that an extinguisher of the same  
classification or the equivalent alternate protection is provided when a portable  
extinguisher is removed from its location for service leaving less than the required  
minimum number of extinguishers. An extinguisher returned to service shall be fully  
charged and in operable condition.  
History: 1979 AC; 1984 AACS.  
Page 12