My comments about fumes were more intended as reasons for not making holes in plaster board.
But intumescent seals when triggered will reduce passage of fumes and there are uses ( not necessarily in domestic use ) where there are primarily fume sealing with heat / fire blocking as a secondary function.
But intumescent seals when triggered will reduce passage of fumes and there are uses ( not necessarily in domestic use ) where there are primarily fume sealing with heat / fire blocking as a secondary function.
