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HI all. I got given a LPG (propane) forge and have used it for about 3 years on and off and never had any issues. Now I'm getting sore thorats, headaches and a bit of nausea after I use it for a prolonged time (full day, multiple days in a row), issues I never had before, same forge and same space. Two things have changed - i relined it and increased the insulation - it initially only had ceramic fibre board insulation. I replaced the ceramic fibre board also used some ITC products to seal thefibre board, boost reflectivity etc.. The other thing I did was I removed the back forge wall with the intention of putting in a door for longer pieces. I got busy and haven't got round to it so the back is open. With the increased insulation, the heat is greater in the forge, and the flame also seems more intense, stronger, and has a greater blast coming out the front. As far as I'm concerned the flame is a good level of blue, though I'm no expert. I'm wondering if the flame is perhaps running too rich and not burning off all the LPG/Propane? Would having the back open effect things at all? My prime concern is that I'm creating more CO now then I was before I relined the forge. There is an air adjustment which I've never messed with because I never had any issues previously, perhaps this needs adjusting?. I have a lot of ventilation via a large barn style sliding door, and air vents which run down one side of the space, which previously seemed adequate I'm after thoughts, advice on how I might go about dealing with this, as I don't really have a lot of experience with gas. I'd like to get back to how it was before honestly, I had less heat but I also felt better! Advice gratefully accepted! Nate