A cheaper alternative for this is to use BuildCraft Iron Pipes under the Red Stone Furnaces and route them the way you want so they will not spill out on the floor. The BC stone pipes did this because they pick a path randomly when exiting the furnace and one side has pipes/an inventory connected to it and the other side doesn't thus causing the spillage.
I use item ducts with mine, they're more expensive but they are much nicer to interact with.
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