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This is a relevant government website referenced from previous link. In our house we have a single open stair well void running top to bottom and we must provide 30 minutes fire protection onto this exit corridor, so we need fire doors; pink plasterboard, etc. So in another post there was a discussion about the wisdom of how the MVHR should be programmed to respond to a fire. Though of course there are still issues of wider smoke damage, risk to occupants, post-fire assessment and remediation, etc..