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Glad you are OK. Fires are scary. I am glad we only have a passive vent in the bathroom. In the UK it has been suggested that the severity of the Grenfell Tower fire (which killed 72 and left 600 homeless) was significantly increased by the recent installation of uPVC window frames and plastic kitchen and bathroom extractor fans. Prior to the renovation, these were aluminium framed windows, and there were no extractor fans. As the fire spread up the building, the plastic frames and extractors failed, which allowed the fire to more quickly spread into living spaces with the plastic acting as a fuel to spread the fire within the apartment. While the cladding was likely responsible for the spread of the fire across the face of the building, the retrofit used large quantities of expanding foam and flammable insulation around parts, and had large void cavities where windows had been retrofitted into the new cladding system.
If I recall correctly expanding foam is usually "expanded" using butane inside the cylinder. I don't know if that remains after the foam is set, but if it does, it almost certainly helps accelerate the process!
Make sure you have smoke detectors properly installed and that the batteries are changed as needed. You can't smell smoke while you sleep. Without a functioning smoke detector, you will not wake up as the place fills with smoke. Without a functioning smoke detector, you will not wake up as the place fills with smoke. Yes, it is worth repeating as many times as needed.I mean everyone, every house, not just pigrew.