7.2.2. At least two extinguishers as recommended in Table 1 shall be provided per storey (floor).

Note: For storeys having an area of less than 100 m², one extinguisher may be provided.

7.2.3. The protection requirements may be fulfilled with extinguishers of higher ratings, provided the travel distance to such larger extinguishers does not exceed the distance shown in Table 1.

7.3. Extinguisher rating and placement for Class B hazards other than hazards in flammable liquids of appreciable depth (in excess of 0,6 cm) and for Class C hazards.

7.3.1. Extinguishers for the listed types of hazard shall be provided on the basis of Table 2.

Note: Extinguishers of lesser rating, for small specific hazards within the general hazard area, may be used, but shall not be considered as fulfilling any part of the requirements of Table 2.

Table 2

Type of hazard

Maximum extinguisher rating

...

...

...

Maximum area per extinguisher, m²

Low

55 B

15

300

Average

144 B

15

150

...

...

...

233 B

15

100

For pressurized flammable liquid and gas fires, see 6.4.

For fires involving water-soluble flammable liquids, see 6.4.3.

7.3.2. Two or more extinguishers of lower rating shall not be used to fulfill the protection requirements of Table 2.

Note: Up to three AFFF- or FFFP-type extinguishers, provided the sum of their ratings equals or exceeds the minimum required rating, may be used to fulfill the requirements of a single extinguisher of the required rating.

7.3.3. The protection requirements may be fulfilled with extinguishers of higher ratings, provided the travel distance to such larger extinguishers does not exceed the distance shown in Table 2.

7.3.4. At least two extinguishers as recommended in Table 2 shall be provided per storey (floor).

...

...

...

7.4. Extinguisher size and placement for Class B hazards in flammable liquids of appreciable depth (in excess of 0,6 cm)

7.4.1. Extinguishers shall not be installed as the sole protection for flammable liquid hazards of appreciable depth (greater than 0,6 cm) where the surface area exceeds 1 m².

 7.4.2. For flammable liquid hazards of appreciable depth, such as in dip or quench tanks, a Class B extinguisher shall be provided on the basis of at least 144 numerical units of Class B extinguishing potential per square meter of the estimated maximum fire area.

Note 1: Where approved automatic fire protection devices or systems have been installed for a flammable liquid hazard, additional portable Class B fire extinguishers may be waived. Where so waived, Class B extinguishers shall be provided as covered in 7.3.1 to protect areas in the vicin