The local fire brigage have required me to fit smoke seals to your bedroom door.
This effectively seals your bedroom and because we (legally) have heat detectors in our bedrooms it is possible that you will die of smoke inhalation before the alarm sounds if a fire starts in your room.
I apologise for jumping into this one late, but I feel you are missing the point of intumescent strips.
If the intumescent strips activate they will not be 'sealing' a living person into the room. By the time the strips are hot enough to activate the person in the room of origin will be quite dead and that death could be easily blamed on to the provision of HD, not the provision of intumescent strips.
What you could also add to your imaginary notice is:
"If I were to fit smoke detection, which I am not going to because I legally don't have to, then you would not be dead in your room, but you would be roused from your sleep and you could then escape."