I bought a house with a Vermont castings Encore stove. This is the first year I am using it. Everything works great, we love the stove but sometimes it makes a weird chemical smell sorta like burning plastic. I have been trying to narrow down when it happens. I think it's when I fill it with wood and the flames burn high towards the top of the box. It sets of the smoke alarm even tho there is no visible smoke. I am burning clean seasoned hardwood only. It has a 6 inch insulated stainless chimney. If someone could give me advise I would much appreciate it.