There are two main types of smoke alarm tech, says Raman Chagger, principal consultant at BRE, the Building Research Establishment. Ionisation-based systems use a tiny amount of radioactive material to charge, or ionise, particles in the air which flow between two small plates. Should smoke interrupt that flow of charged particles, the alarm goes off.
“The first step of solving a problem is admitting that there is a problem,” he says. “That’s the piece that I’ve been most interested in—the acknowledgement that we need to do something about this. We’re seeing a real shift in how the industry talks about this issue.”
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