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Dr. Md Rushad Rahman
এমবিবিএস(আরপিএমসি)
,
পিজিটি(মেডিসিন)
The manufacturers of most residential consumer smoke alarms recommend replacement no later than 10 years after installation. Some CO alarms (in combination with smoke alarms) may have sensors that fail sooner than that. In commercial installations, the contracted maintenance technicians must routinely test the alarms and sensors and replace any that fail, which may be less than 10 years or more.
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