Carbon monoxide is a product of (incomplete) combustion, and is lighter than airNot at all.
I only have one.
But what concerns me is many have none at all!
If one of your three is in the gas locker, and you have a Hymer, it's not going to warn you of any leak there, as there is a grill on the floor of the locker.
Front and back on the living area should be enough.
So a detector should be positioned high up in the space it is there to monitor
Also, if you have combustion in your gas locker…………..
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