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First Alert CO-FA-9B review

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Our tests show that you can’t rely on all carbon monoxide alarms to alert you when you need it most – but is the First Alert CO-FA-9B one of them? We put it through a battery of tests to find out, including exposing this carbon monoxide detector to four different levels of the poisonous gas and assessing its instructions and the clarity of its alarm.
Is it worth your money?
Or is it a waste of cash?

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