How many smoke alarms do I need in my home?

I have 2 storey house. or:I have 2 storey house.or:You only need one in the location where you are most likely to get smoke, preferably not close to t

I have 2 storey house.

or:I have 2 storey house.

or:You only need one in the location where you are most likely to get smoke, preferably not close to the kitchen. If you get two you will have twice the annoyance from false alarms.

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