D.M. Procida wrote:
http://www.westcountryfires.co.uk/fires/products/382.asp

It's a flueless gas fire. In other words, all of the carbon dioxide it
produces will remain in the room, instead of going up the chimney to
draw in fresh air from outside.

A bit pricey at £1300 though.

"the fire has the ability to burn off the odorous and stale air in the
room and efficiently return warm and neutral air back into your
airspace"

Wow.

People are often astounded at flueless gas fires, especially with all the
hype surrounding carbon monoxide over the past few years, often with
unfounded fears...this particular model utilises a 'catalytic system', but
even without it, they are completely safe.