Smoke Detector

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Smoke Detector

Smoke Detector

If the air in the chamber contains particles (dust or smoke), the light is scattered and some of it reaches the sensor, triggering the alarm. According to the National Fire Protection Association (NFPA), "photoelectric smoke detection is generally more responsive to fires that begin with a long period of smoldering".

Smoke Detector Installation


Smoke alarms should be installed at least 10 feet (3 meters) from a cooking appliance to minimize false alarms when cooking. Mount smoke alarms high on walls or ceilings (remember, smoke rises). Wall-mounted alarms should be installed not more than 12 inches away from the ceiling (to the top of the alarm).

  • An ionization smoke detector uses a radioisotope
  • smoke detector contains a source of infrared, visible, or ultraviolet light
  • Smoke Alarm at least 4 inches (102 mm) from the wall or corner.
  • wall/ceiling line, below typical “dead air” spaces
  • Interconnected smoke alarms are required
  • They may be hardwired or wireless, and 10-year backup batteries encouraged.


Smoke detectors are arguably the most important components in your home. Well maintained smoke detectors save lives by providing you with the early warning signs of smoke or a fire.

  • Have smoke detectors installed in all code-compliant areas
  • Test smoke detectors monthly for proper functioning
  • Clean smoke detectors annually
  • Trusted Residential Smoke Detector Service & Repair
  • Fair and consistent pricing with NO hidden costs
  • Licensed, bonded, and insured technicians

Smoke Detector


Our technicians arrive in our red trucks that are fully stocked with everything needed to do the job right the first time. Mister Sparky® electricians are licensed and insured and backed by an industry leading 100% satisfaction guarantee.

  • If the alarm chirps, warning that the battery is low, replace the entire smoke alarm right away.
  • Follow manufacturer’s instructions for cleaning to keep smoke alarms working well
  • When replacing a battery, follow manufacturer’s list of batteries on the back of the alarm or manufacturer’s instructions
  • The smoke alarm may not work properly if a different kind of battery is used.
  • Replace batteries at least once a year or use long-life batteries
  • Replace your smoke detector every 7-10 years

Security saving tips

  • Make sure all windows are fitted with key-operated window locks.
  • Check that all windows and doors are locked before going to bed.
  • Never leave keys in window or door locks..
  • Hide expensive equipment, such as mobile phones and laptops, from view. .
  • Keep your valuables in a safe place and out of sight.
  • Set a timer to switch your lights on and off at varying intervals when you're out to make it look like someone is at home.