What determines in which fluid output hatch, or item output bus the craft result gets put in when the multiblock has multiple output hatches/buses? I currently have the plan to make a large blast furnace that outputs flue gases, molten slags and molten metals. However, the outputs of the fluids don't end up in their preferable output hatches (i.e. flue gas fluid at the topmost fluid output hatch, molten slag at the middle output hatch, and molten metals at the bottom fluid output hatch).

EDIT: I've done a little bit of testing, and it seems that for the recipes, the order of the fluid output elements determines the "order", where the first output fluid gets output to the topmost fluid output hatch, second fluid to a lower hatch, and so on. Have yet to test it with lateral hatch placements, but it's a good start knowing this.