Wet Chemical Fire Extinguishers are specially designed to tackle Class F fires. Class F fires are those involving cooking oils, and fats used in commercial kitchens, restaurants, cafés, and catering environments. At Francis Fire, we supply, install, and maintain high-quality wet chemical fire extinguishers across Cheshire. We will ensure your premises are safe and fully compliant.
A wet chemical extinguisher releases a fine potassium-based mist that settles over the burning oil. This produces a chemical reaction known as saponification. This results in a soapy layer over the surface of the oil or fat.
This layer performs two vital functions:
The extinguisher’s lance-style nozzle also allows safe operation at a distance. That’s essential when tackling fat and hot oil fires.
Wet Chemical Extinguishers are perfect for environments such as:
You can also use wet chemical fire extinguishers on Class A fires (solid combustibles like paper and wood). However, their main purpose is for cooking oil fires and fat fires.
You should NOT use Wet Chemical Extinguishers on:
If you operate a kitchen, café, or food business, you MUST ensure you have the right protection in place. Francis Fire offer free site assessments and expert advice on the correct extinguishers for your premises and your fire risks.

Download our brochure
Please do not hesitate to drop us a line, Monday – Friday 8:30am-17:30pm.
Alternatively email us and we will get right back you.
Using the wrong extinguisher on a cooking oil or fat fire can be dangerous. For example, water can cause violent splattering, which will spread the flames to potentially engulf the area.
A Wet Chemical Fire Extinguisher will safely control and cool these fires, offering reliable protection where it matters most.
It's likely that your Wet Chemical Fire Extinguisher(s) will last for up to five years from manufacturing if they are serviced annually and kept in top working condition.
At Francis Fire Ltd, we provide a complete service for all your fire extinguisher supply and servicing requirements, including Wet Chemical Extinguishers. We take care of clients all across Cheshire:
- Fully certified fire extinguishers, meeting BS 5306 EN3 Standards.
- BAFE Third Party Accredited
- Expert installation and placement advice for your specific kitchen layout
We assess your premises to determine the correct extinguisher type, size, and location.
Regular servicing and inspections to keep extinguishers fully compliant and operational.
Detailed, digital maintenance records and certification to meet your fire safety obligations under The Regulatory Reform (Fire Safety) Order 2005 and your Fire Risk Assessment.
Please do not hesitate to drop us a line, Monday – Friday 8:30am-17:30pm.
Alternatively email us and we will get right back you.
Download our brochure
Please do not hesitate to contact us using our secure form. Alternatively please email or telephone us.
Monday – Friday 8:30am-17:30pm