Question on 520 install

Hello All:
I am in the process of installing a square door 520, and have a question. What would be your opinions on cutting a new hole in the rear side for my furnace flue pipe? It would simplify my install if instead of having a couple 90's in my pipe run I could just weld up a plate with a thimble, and attach it to one of the rear sides. I would then just cap off the original flue exhaust and I could access the back chamber by removing the cap and vacuum it out periodically that way. I can't see any particular reason to not do it, although it might not scavenge the flue gases quite as well , but I have a ton of draft. Thoughts?

Well I did it anyway. No answers from anyone so I guess I'm on my own on this one. If it doesn't work I'll post....

I don't really understand your question. You already have a flue port on the rear of the base. If you move it, you may not get the full transfer of heat to the water. You also don't want a ton of draft. You want to install a damper so you get the proper amount of draft. Too much and you're wasting heat.

I wanted to ( and I did) move the flue port from the rear , to the left hand rear side. So I moved it 18" +- and 90 degrees. It was either do that, or have 2 elbows to get around the rear with the flue pipe. I will be adding a barometric damper, as I always had one on my hand fired boiler. I only mentioned having lots of draft, as the only drawback I could see was a slight diminish in the scavenging on the rear right of the boiler now.

Unofficially, I can't see any problem with your new flue location.

Well thanks, if I think I see any problems with this I will post, so nobody else makes the same attempt/mistake. I'm also going to put a cap on the original port, and use it for a cleanout during the year.

There are blank covers made to cap off an unused opening but we ran out of them. The next best thing is the bin pipe cover.