It is common to have one smoke detector per floor, but the U.S. Fire Administration recommends the installation of both an ionization chamber detector and a photoelectric detector or one dual-sensor alarm per floor. Choosing one battery-operated and one hardwired detector ensures your home is fully protected because it is far less likely that two detectors will be inoperable at the same time.

To be on the safest side, place one detector in every bedroom, and at least one on every level of the home, including the basement and attic.

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