It is possible to install a damper in the appliance connector. There is a thread where the member used a socket u joint is used to extend it through the surround. Not sure how one would add two dampers on an insert. Probably one would seal off the holes present in the first damper and hope you didn’t need a second.
Theoretically it wouldn’t have to be adjusted and could be set an left alone. But that has not been my experience. I got smoke rollout with it 85% closed so I would open to reload. I don’t have a lot of burns with it installed maybe 10 loads. I think I was
I don't see how you could possibly install an inline damper up above the old fireplace damper opening. And even if you could servicing it later would be next to impossible
If the OP went with a BK insert with the 35 foot chimney what would be your recommendation? Have you seen someone transition from 6" to 8" with such a tall install to reduce draft?
There are plenty of our inserts on 30' stacks without dampers being used, no complaints. I'm certain there are a few in NWT that have our units on 30' stacks (stoves more likely than inserts) and the thermostat handles them just fine.
The OP is talking about an insert on a 26% taller flue system than 30 ft. I suspect that if tested they would be operating well beyond the target spec of .05wc. unless the insert is in a negative pressure zone.
Yes but what happens when a door gasket gets just a little compressed? In a stove that has proper draft it wouldn't be an issue at all. In a stove that could easily have 3 to 4 times the specified draft it turns into a problem very quickly. Same with glass gasket bypass gasket etc. Can it pull through the ash plug?
Sure enough. But that is why we use the knife edge seal to the front door gasket. The bypass is a cam over design constantly apply pressure. The glass gasket is a potential issue on any gasketed door. But, your point is valid. Too much draft is too much draft...
I will only consider it if allowed by the stove manufacturer. And it may or may not have the desired effect. Yes that will reduce volume but also increase velocity. I have put a reducer at the top with varying success because that restriction adds some back pressure at the top slowing things down in the chimney.
Hot gasses rising up the chimney creates the draft...and that is what makes the stove work, not the other way around. The same stove on a 15 ft chimney vs a 25' can (will) act totally differently. Certain stoves do better on shorter chimneys and some do better with tall ones...almost none are gonna like over 30' (I know some manufactures say its fine, but you are still just asking for trouble)
