Is it OK to have a single trap for three combined condensate lines? (90% furnace)

1) A-coil 2) Flue inline drain 3) Inducer housing

As installed, each line tees into the same horizontal 3/4" PVC and then down into a trap and out to the drain.

Aren't each of these normally at different pressures? It seems that positive pressure from the supply plenum would interfere with drainage from the inducer.

submitted by /u/GloomyClown
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