Below are some of the most frequently asked questions asked by HVAC fire duct workers about commercial kitchen smoke and fire ducting.
Q. How is a commercial kitchen fire duct rating measured?
Commercial kitchens are a unique ventilation requirement. The extraction systems for commercial kitchens are subject to the migration of combustible contaminants, namely grease. Because the inside of these ducts may become lined with grease particles, it creates a potential fire risk.
The EN tests standard EN 1366-1 has a section dealing with combustible linings.
In section A.6:
“For kitchen extraction ducts or where internal combustible linings are used, additional temperature measuring points have been specified, together with a criteria of 140°C/180°C.”
During an EN 1366-1 Type A test, 4 thermocouples are positioned inside the duct section inside the furnace. They measure the surface temperature of the metal to the temperature tolerances above.
Q: Do I need to insulate inside the kitchen?
Q: Can I put a fire damper in a kitchen extract?
Fire dampers should not be used in the extract system of a commercial kitchen. (According to the regulation BS 999:2017 Section 18.104.22.168)
Fire dampers are used to maintain compartmentation in the event of a fire. Compartmentalisation is the foundation of all fire strategy, restricting the spread of fire from one location to another by ensuring the envelope of the compartment is capable of restraining a fire from migrating through a building.
The presence of grease would render fire dampers inoperable, so they offer no protection against fire and damage. Compartmentation of a commercial kitchen is maintained by the existence of a fire resistant duct, one that is manufactured and tested to the European Standard EN 1366-1 and classified to EN 13501-3.
Thor Duct ® manufactures EN standard approved kitchen ductwork. More information here.
If you are interested in becoming a licensee manufacturer of Thor Duct ® ductwork in your region, you can find out how to apply here.
Q: What is the standard for commercial kitchen extract ductwork?
- Talk to us about how Thor Duct ® products can ensure you reach the relevant standard for fire safety compliance. Contact us or call +353 1 4040 909.
- Contact us or call +353 1 4040 909 and let’s have a conversation about the fire risks how Thor Duct ® can protect you to deliver world class standards.
- Interested in becoming a licensed manufacturer? Contact us to discover more about how you can deliver world class standards from your own manufacturing premises.
Q: Do cleaning doors need to be fire tested?
Cleaning doors are an essential element of a commercial kitchen extract system.
The number of access doors is determined by the presence of detailed cleaning specification/method. In the absence of a cleaning specification, doors should be installed at 2 meter centres to provide adequate access for cleaning. (DW172 Section 18.14) The test standard BS EN 1366-1 incorporates access doors into the test method, specifically prescribing the location of the access door in each test type and orientation. The maximum size tested is the maximum size permissible in the system.
Thor Duct ® supplies fire doors and you can even order online. View full spec of fire doors here.
Michael is an expert in fire rated ductwork
For any further questions or to ask about a CPD presentation please contact Michael Renaghan, Technical Lead at Thor Duct ®.