It´s ok. I´m allways willing to help. But sometimes it´s frustrating to always write the same thing, especially when the infos are written in the guides and books.
But I just see there is an error in my post dated May 27th. 5.49 pm. The minimum quantity of coal is not 350 g per qm of room air, it´s 135 g.
As allready explained in the guides, you have to seal the exit room from inside perfectly. When we talk about a room in a house, you would use a high quality(!!!) parcel tape or insulating tape to seal all openings, such as holes, cracks, keyholes....etc.. Don´t forget the air conditioning and ventilations.