The purpose of this page is to provide further information regarding the
provision of Class F cover in accordance with the recommendations of
BS 5306-8:2012. Readers are referred to
the British Standard itself for full details and reminded that this is a summary
Throughout, references to the pertinent parts of the British Standards and/or
other legislation have been included as
All fire hazards involving vegetable or animal oils and fats in
cooking appliance (including pans)1
(e.g. deep fat frying, shallow
should be covered by one or more class F
extinguishers2 and possibly a fixed system3,
4 as set out
below (but refer to notes):
|Class F Hazard Surface Area
|not in excess of 0.11m²
||One 75F extinguisher
|not in excess of 0.4m²
||Two 75F extinguishers
|in excess of 0.4m²
||Fixed system3, plus extinguisher(s)6
Please note that 0.11m² = 1 sq ft, or a rectangular area
0.3×0.36m (or 30×36cm, 12”×14”), or a circular area of diameter 0.37m (or 37cm,
The larger area, 0.4m² = 4sq ft, or a rectangular area 0.3×1.33m (or 30×133cm,
1’×4’), or a circular area of diameter 0.71m (or 71cm, 28”).
Even where such fire hazards require a fixed system (e.g. where
cooking arrangements might restrict access by a class F extinguisher4 or where the surface area in
excess of 0.4m²3, a class F extinguisher(s) is nonetheless also required to cover the risk of spillage or fires outside of the fixed
The only extinguishers that should be selected for such fire hazards are
those with a class F rating7. Use of other extinguisher types on
Class F fires can be hazardous and may spread the fire.
Class F extinguishers should be sited such that there is not necessary
to travel further than 10m to the site of any potential class F fire8. These travel distances should be
reduced if there are doorways on this route8.
The British Standards are covered by copyright and are not available freely. However, these can be purchased at
British Standard Online or alternatively, some libraries may carry copies of
the more common standards.
- As per BS 5306-8:2012, clause 7.1 - the
fire merely needs to involve vegetable or animal oils and fats in a cooking
appliance. That pans are included is clear from example 5 at clause 8.6.2.
- As per BS 5306-8:2012, clause 8.6.2.
- As per BS 5306-8:2012, clause 8.6.1.
- As per BS 5306-8:2012, clause 8.6.2 note.
- As per BS 5306-8:2012, clause 8.6.2
Table 2. Note that ratings of 5F, 15F and 25F are discussed in the
full table. These are not available items and so not included here. The reader
is referred to the Standard for full details
- As per BS 5306-8:2012, clause 8.6.3.
- As per BS 5306-8:2012, 7.2 warning.
- As per BS 5306-8:2012, clause 6.4.