The stove pipe in this video is temporary and provided a way for me to test the CO level and how well the fans we installed worked. At the end of the 1st video I pressed the top button and got a high reading, then at the beginning of the 2nd video I checked it using the bottom button and it was 28 which was just after loading the meat in the cooker. Having the door open for a long time increased the level but not over the danger zone of 30pps. A reading of 15 was constant throughout the cook. Even with the low reading of 15 for the most part, I would not recommend this setup unless you have a divided living quarters and then I wouldn't do it unless you had a 2nd co detector for the living qtrs. My trailer does not even have an entrace to the cooking part from the living qtrs and is sealed off with a solid wall. Not shown in the pic is a 2nd power vent just like the one over the smoker just to the right of it.