Project is now continuing as the weather is good again for a few days.
A quick Q on your diagram. 4.75" would be the total height of the opening then? (where it says 4.5" currently) I'm not sure how to calculate the RF plate width at 4.75" is this diameter also on your diagram somewhere.
Last Q for now, how big should the gap between the end of the RF in the CC (with the lip) be, to let the heat rise? I had in mind 30", with the CC being 35" would give me a 5" gap. Thanks.
The inside opening should be 4.5 I added .25 for steel thickness. For the pate width, just measure up the end of the CC 4.75 and then measure across the CC and minus the steel thickness (2x) of the CC (it should be about 15.125 - 15.25 or so). Calcs are good for the plan then need to be adjusted in Fab (this isn't a high precision tool....) For the CC opening 4.5 to 5 inches at the end will be fine. You just want a little bigger (say 30% or so) opening than the FB to CC opening.
PS...A 1" high RF Plate dam is nice.....Oh and this is just me but I wouldn't have an issue welding the plate in with the dims you have, just don't put a hard 90 in the smoke stack that will cause an issue with flow. cut an oval hole (on the radius) or add a plenum on the flat next to the FB.
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