I would like to see this plate steel collector you are planning. Better off making it from sch 40 pipe.
well its realy simple … considering 4 round pipes dont realy meet a square flange opening perfectly, you angle cut the 4 pipes, set them up on the flange so the tip of each pipe is sitting on one of the corners of the opening, then fillin the gaps with some flat steel
it’s $200 (it would cost you about 400-450 if you called burns up and had them make you one), and it’s really not that long. I thought you said you needed it flanged for a T3?
not quite