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Smoke detectors are one of our best friends when it comes to home safety, saving lives every minute off the day. It is recommended that every home has at least one smoke detector per floor.

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Smoke detectors consist of two components to let you know when there’s smoke. They consist of two basic parts, first a sensor to sense the smoke, secondly a very loud electronic horn or siren to warn people that there is an emergency.

Smoke detectors.

All smoke detectors can run off of a 9-volt battery or 120-volt house current. We can usually smell smoke and do something about it, but if we’re asleep at night, then we have a problem as smoke can steal the oxygen we need, and also produce carbon monoxide gas that can send us into a deep sleep.
Smoke detectors should be screwed to your ceiling, as smoke rises. When something starts to burn, the fire generates hot gases and because these are less dense & thinner in weight, causes the air to rise upward.
Ionization-type smoke alarms 
Generally more responsive to flaming fires.
How they work 

Ionization-type smoke alarms have a small amount of radioactive material between two electrically charged plates which ionizes the air and causes current to flow between them. When smoke enters the chamber, it disrupts the flow of ions thus reducing the flow of current and setting off the alarm.

Photoelectric smoke alarms 
Generally more responsive to fires that begin with a long period of smoldering fires.


How they work 

Photoelectric-type alarms aim a light source into a sensing chamber at an angle away from the sensor. Smoke that enters the chamber reflects a light onto the sensor triggering the alarm.
A closed door may slow the spread of smoke, heat and fire. Install smoke alarms in every sleeping room and outside each separate sleeping area. Install smoke alarms on every level of the home and in the basement and ensure they are interconnected so when one sounds they all sound, replacing them when they are 10 years old.

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To Do:
Smoke alarms play a vital part in home safety, as well as a proper fire escape plan. Test all smoke alarms at least once a month and don’t install smoke alarms near windows, doors, or ducts where drafts might interfere with their operation. 
Smoke alarms of any type of need a new battery at least once a year. If the alarm chirps, it is a warning that the battery is low, replace the battery right away. When looking for the best smoke alarm, be sure to look for an alarm that’s been tested to the BS EN 14604 standard.


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Write on the smoke alarm itself the day that it was installed, and the date that it or the battery, should be replaced. 
This saves you having to remember when you got it, or when the batteries are needing to be replaced. Regular beeps or chirps are a sign that the battery needs to be replaced. Fire safety signage.


More frequent beeps (one every 30 seconds) are likely to be a sign that the alarm or battery has reached the end of its life and should be replaced as soon as possible.


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70 Bounces Road, London N9 8JS

Telephone: 020 3961 8181

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