Hello Mick,
Thank you for your concern. But when I use the nipoori inside it is normally all done and dusted in 30 mins and I only have it standing just inside the open front doorway. And even if I did have it fully inside with the door closed It would not be an issue as I live in a very old property with far from air tight windows and a very large open inglenook fireplace so there is certainly plenty of fresh oxygen available - as Mrs coogan would vouch for in the winter.
Mind you If I lived in a central heated, double glazed, insulated, air tight, modern property and used the oven for long enough to reduce the oxygen levels significantly enough for the solid fuel to discharge carbon monoxide I would certainly be in danger as you say. And would most certainly recommend having all the windows fully open.
Bon point indeed.