There is a potential problem here. When the JUCA creates warm air,
it will certainly get to this tee. But it would not necessarily
turn right to go toward the house register outlets. Some of it
would try to go left, back through the other furnace's house air
system. This heat isn't exactly lost. It doesn't go up the chimney or anything. But if there was enough of it, it could go completely through the other furnace into its cold air returns. If the air was still hot when it got there, some safety concerns could result.
So, what to do?
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