My Defiant leaks smoke into our home only at the tail end of a burn cycle. I notice it when I return home from work in the afternoon, but not generally in the AM before departure to work. Stove history: I've been using this Defiant 1A stove for 10 years as the primary source of heat from the first floor of our two story raised ranch. I personally rebuilt the stove four years ago with the fireback kit from a VC dealer. Two years ago, after a chimney fire in flue 1 of 2, we installed an insulated 8" SS flexible liner inside the 12"x12" tile of flue 2 (which went to the fireplace upstairs), broke though the masonry floor of the fireplace, and connected to the Defiant downstairs. Flue 1 was abandoned and capped; the fireplace opening upstairs was bricked in. Now we have one 90 degree stovepipe bend over the stove to the thimble and the SS tee at the outside cleanout and then 22' of straight vertical liner to the cap. The draft was appreciably better than before and we can use the horizontal damper function where we couldn't pre-liner. Last season was our first year with this setup and things seemed fine, to me. My wife now says there was some smoke inside at times and more dust overall. This year I notice the smoke almost daily as I'm allergic and feel symptoms, and slight haze on a sunny day, in the afternoon when the AM fire is almost out. The dust on furniture is also noticeably worse than before. Anyway, I've resealed the griddle seal and caulked all crevices in stovepipe joints. Still smoked today. I have no idea why or where its coming from? The stove is in great shape as I completely rebuilt it 4 years ago. As part of my problem solving process this winter, and because my house is pretty tight, i installed a 3" fresh air intake to provide some outside air to the area around the thermostat damper and secondary air port. I'm certain there is no smoke coming in from that port...just fresh, cold air. The other reason for the fresh air intake is because the draft is so good with the liner it can suck sewer vapor from the garage floor drain. That problem was fixed by a vapor gas plug and the fresh air intake. Has anyone had this issue before after a liner was installed? Is the draft being stalled by a cold chimney and liner while the stove is still warm? Why did this not happen pre-liner? Confused.