Here are the shots of the 28-3500 install. Thimble shot shows detail of penetration to outside. I have a black metal plate that covers the wood framework and fiberglass as a "surround" that I removed for the shot. The thimble itself has no insulation in it. In this area it is double wall pipe connecting to the Class A before exiting the basement. The shot doesn't give much depth perception but it comes in through the thimble and mates up with a double wall 45.
Second shot shows the two pipes coming out of the stovetop. 8 inch in the front is the hot air that connects to the natural gas furnace. I started out with a T for two reasons - first, in the event of a power failure (didn't own a generator at time I installed it, but I do now) I could "dump" the heat to the basement only and not overheat the Nat. gas furnace ductwork, which I lowered to have a 2" air gap from the overhead joists, and secondly so that if it got too warm on the first and second floors (My wife doesn't like it as warm as I do, about 74 - 75 degrees is plenty for her) I could "dump" the heat before it went through the ductwork. I made the cover for the T and also made the damper that is inside the T and is operated by the little spring handle. 6 inch is the flue. Flue take off from the wood furnace is a 12" long piece of single wall going up to a double wall 90.
Third shot shows the 8 inch where it connects to the plenum on top of the Nat. gas furnace. After it goes in there is a 90 that turns it up so that if the Nat.gas furnace ever kicked on, (it hasn't kicked on except for when I cycle it to make sure it still works) it won't be forcing air back to the stove. I chose not to install a butterfly because of the way I have the 90 inside the plenum skewed towards the ductwork that goes the the back end of my house which is the windward side. My ductwork also has dampers so that I can control the heat output into individual rooms as well.
Fourth shot shows a nice frontview full of warmth. I drilled a small hole to mount the temp gauge on the front of the stove. Since the stove has an "air jacket" surrounding it, putting it on top could be done with a probe type gauge, but for me this is sufficient. The temps read lower than they would if it was on top but when I compare them to the stovetop temps on our Lopi upstairs in the living room, they are lower by about 150 degrees. I don't "burn by the gauge", but it is nice to have as a reference and for the initial learning curve of using the furnace.
Last shot shows the two Class A chimneys on the outside of the house. Front chimney is Lopi upstairs, and back one is the Englander. I ran the chimney down towards the ground on the front (Lopi) chimney in case I ever decide to build a chase to enclose them. That way I can easily pull the plugs at ground level for cleaning. On the back (Englander) chimney, I ran the pipe up 18" higher since it is the windward side. I primarily burn the Englander 24/7, but when it's below 10 and the wind is whipping through the wide open area of the park behind my house I'll fire up the Lopi as well. I have no problems with any smoke smell downdrafting into the livingroom when the Lopi isn't burning.
Wow, I didn't mean to ramble on so much, but I hope this helped. Happy to answer any other questions you might have!