Hitzer added a movable damper to the 503. I had read about the draft issues other 503 owners had and asked about the restrictor plate when I ordered the stove. They told me it was no longer necessary as they had a design change and added a damper. There are a couple of shots of it in the pictures above.
The flue is 102 sq inches and the stove collar is 28 sq inches. Hitzer specs 84 sq inches as maximum size flue, 3 times collar size.
I was curious where the manometer should be ported to in regards to the built in damper.
No place to locate a barometric damper as it is a fireplace insert and the space in the firebox is inaccessible with the stove running.
Going to mount the manometer as a permanent install to facilitate damper adjustments along with the temperature probe.
I have gone through the MPD threads and understand the issue of weak draft and CO.
I am starting to lean to the insulated liner side of the equation as the parameters for a good reliable draft are borderline with this particular chimney.
I have the height but it is a large chimney with 3 flues, exterior, rectangular, large surface area exposed to outside temps, north side of the house, over sized flue and an efficient coal stove that has a lower temp exhaust.
I want to be able to run the stove in the early spring and late fall when a good draft would be necessary.
A nice September day spent on the roof installing the insulated liner seems to be a good investment at this point.
I still would like to know about the manometer port, pre or post MPD.