Call the Fire Department, they’ll tell you what to buy. If you go to any Ace Hardware, they’ll tell you as well. Not much of a choice of recommended models really, there’s a huge display of the recommended models. You need to replace the CO2 detectors at the same time you replace all the smoke detectors.
Buy the correct number that you have in your house then call the Fire Department. They’ll send a couple of firemen out with their own ladders to install them at no cost to you. Do the same thing when batteries need to be replaced. Do them all at the same time, once a year (before they begin beeping).
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Politicians are like diapers--they should be changed frequently, and for the same reason.
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