Consumers are being advised to stop buying fridges and freezers with flammable plastic backs, which could create a fire risk.
A Hotpoint fridge-freezer has been cited as the starting point for the fire that spread throughout Grenfell Tower.
However, it is still being examined by forensic officers, and it is not known whether it had a flammable back.
Safety tests
In tests carried out by the London Fire Brigade, a fridge with a plastic back burst into flames after 90 seconds of having heat applied to it, and had to be put out after two-and-a-half minutes.
However there is no evidence that anyone has been killed or injured as a direct result of flammable plastic backs.
Which? examined 506 fridges, freezers and fridge-freezers that are currently on sale in the UK, and found that 46% of those do not have fully flame-proof backs.
Of 26 Hotpoint models they examined, only one had fire-resistant backing. None made by Ikea had one, and of 12 Indesit models, only two had the safety feature.
By contrast, all the models made by Beko, Bosch, Grundig, LG, Miele, Samsung and Siemens were fully protected. Most of these have metal backs.