ᐅ Dual fan variants – advantages and disadvantages

What are the actual advantages of decentralized units with two smaller fans in one duct compared to the traditional models with one larger fan?
I can't seem to find any concrete information on this. Are these used in specific situations?

Does no one have an idea here? Has anyone installed these dual fans? If yes, why?

Aren't they designed for heat recovery? Old warm air is exhausted and new cold air is brought in. In the heat exchanger, a portion of the energy is then recovered.
A fan can only ventilate or, by reversing the airflow, push the air back and forth.

JaiBee07 schrieb:

Does no one here have an idea? Has anyone installed these dual fans? If so, why?

Who manufactures something like this? I’ve never heard of it—until now, it’s always been “duct in the wall with a reversing fan on the inside.”
How are the motors/fans installed? If the “exhaust motor with fan” is built into the duct, it would actually interfere with the “intake motor with fan” and reduce efficiency (not to mention the extra costs from using double the materials).

Maybe a large enclosure with two fans, each in separate ducts for dedicated airflow directions, but with a single heat exchanger that can operate in both channels?

There are also decentralized ventilation systems with counterflow heat exchangers – although I have never seen one in practice, I would always prefer them over the swing ventilators.

Just search for Passive House Institute and then take a look at the components database. There are a few decentralized ventilation units for single rooms listed there.