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Monoflow with black pipe

I'm looking for someone to shed some light on a dispute for me. We are in the process of installing a heating system for a new truck wash. The design calls for a single 2" monoflow system feeding approximately 10 hot water unit heaters. I would like to run the piping in copper but my boss wants to run it in black pipe using standard black fittings. How do you do this when there isn't a venturi fitting made for black pipe? He wants to reduce the size of the run on the tee to create flow through the branch. For example, to feed a unit heater with 1" pipe, he wants to use a 2 x 1-1/2" x 1" tee. I don't think it will work, but I may be wrong. Can anyone shed some light on this subject?



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