what type smoke alarms

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i am fitting smoke alarms in my house top & bottom of stairs hard wired interlinked with a 3 core...do i need optical smokes bat back up in this situation or ionisation cheers :)
 
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cheers echos..bought an optical mains + 9v bat back up & an ionisation 9v mains/bat back up today from screwfix ionisation was £12 approx and the photoelectric was £26 ? why is the optical much more expensive :eek: ..needed them both anyway so just bought them think they are dicon so presume of a decent quality at that price...+ ive also boarded the loft out fitting a loft ladder hatch kit..using for light storage etc should i fit a detector in the loft.. :)
 

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