dMVHR with ducts?

Most dMVHR units I’ve seen either alternate the air flow direction or have ducting very close together, which (even with hoods) seems like a risk for unwanted recirculation between sides. Does anyone know of a make or model of unit that allows units to take a short length of duct (maybe 1m?) to mitigate this?

Also happy to hear explanations as to why I should relax and not care about this…!

I know there were such models about 15 years ago but didn’t keep details. Incidentally, the short length of duct might enable you to supply and extract to/from adjacent rooms, if the unit is installed near enough to their party wall, e.g. bedroom to en-suite.

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