Eight fire engines and around 60 firefighters were called to a fire at a mid terraced take-away restaurant with dwellings above on Great West Road in Hounslow.
Part of the ground floor, half of the roof and the entire ducting (extraction system), leading from the ground floor to the roof, were destroyed by the fire. There are no reports of any injuries.
Two of the Brigade's 32-metre turntable ladders were deployed to the scene to help fight the fire from above.
A London Fire Brigade spokesperson said: "We'd like to remind restaurant and takeaway owners to ensure they don't have dirty ducting. If you don't clean your extraction system regularly, you're at a greater risk of ducting fires.
"You should also make sure you keep the hob, cooker hood and extractor fan clean too – built up fat and grease can ignite and cause a fire."
Control Officers took the first of five calls at 1523 and mobilised crews from Heston, Southall, Heathrow, Ealing, Hayes, Hillingdon and Kingston fire stations to the scene. The fire was under control by 1653.
The cause of the fire is believed to be due to cooking oil igniting in a commercial deep fat fryer.
Firefighters' top tips for restaurants and takeaways:
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Have ducting in your extraction system (ventilation) cleaned regularly
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Ensure ducting is installed correctly
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Take extra care when cooking with hot oil as it can easily overheat and catch fire
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Never fill the pan more than one third full of fat or oil
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Make sure food is dry before putting it in hot oil - oil and water are a dangerous mix
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Use an electronic deep fat fryer if possible - they have automatic temperature controls and are much safer
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Ensure your electrical system is regularly tested
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Complete your Fire Risk Assessment and make an emergency plan.