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Ionisation or Photoelectric (Optical)?

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Which smoke alarm should I choose? While all smoke alarms are designed to detect smoke, certain sensing technologies react differently to certain types of fire.

Photoelectric sensing technology is generally more sensitive (than ionization sensing technology) at detecting large particles.
Large particles tend to be produced in greater amounts by smouldering fires. These fires may smoulder for hours before bursting into flames.

Ionization sensing technology is generally more sensitive (than photoelectric sensing technology) at detecting small particles. Small particles tend to be produced in greater amounts by flaming fires. These fires consume combustible materials rapidly and spread quickly.

For optimum protection we recommend the use of both photoelectric and ionization alarms on each level of a house.