I have five! And I just checked them as part of my semi yearly maintenance.
Kitchen under stove, laundry room by dryer (wife and kids refuse to empty lint trap, smdh), one each by both furnaces (different parts of the basement), and one in the garage.
Yeah, 4. Bought when we bought the house. Kitchen, bedroom, garage, and living roon where the wood stove is. Little one-time use ones in basement and kitchen again.
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