And, most ovens/ranges/cookers are not running sufficiently long to create problems. However, a gas cooker with a faulty gas line can be just as pernicious. And, here in the US, many states require that gas stoves (natural or LP) have kitchen fans/vents over the stove as an extra added precaution.'m not really answering your question per se, but our gas fire in our lounge does have a flue. It runs up through the wall cavity and pops out of the roof above our lounge. We have a wall gas furnace in our family room that also has a flue.