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Are ventless fireplaces really that bad?
I've just moved into a new house and I'm currently looking into getting a new fireplace. There's no chimney so I'm liking the idea of a ventless fireplace, but there seems to be a lot of concern about them online. For example, this site says they are potentially hazardous: http://heattalk.com/best-gas-fireplace-inserts-reviews/
But surely if they are fitted with oxygen depletion sensors and catalytic converter it's relatively safe?
Views would be appreciated, cheers