I've used the LUNOS HRV a bunch & think they are a non-negotiable item for anyone 3+ season camping. I don't but if you have any sort of combustion happening inside the envelope of your camper perhaps even a critical safety item in the winter.
Biggest plus to the LUNOS for me is it's modular so I can make my own plenums and its 12vDC.
They work great but need a bit of modification to work properly on a mobile application IMHO.
The inside air exhaust / fresh-in outlet is ok if you have a dead ended cabinet. The exterior in/out cover isn't optimized for road speed in the rain as they are meant for a stationary application. I disassemble them and print my own interior and exterior plenums. On the outside it's pretty simple, a basic cover splitting the intake/exhaust airs & canted to the rear so wind underway doesn't venturi rain water back in. On the inside I print an end cover with a magnetic plenum for ease of assembly and that directs the intake fresh air through an adjacent bulkhead. The cabinets are vented so the exhaust air is pulled from inside the camper away from the fresh in. Hard to separate the two flows outside but you can't win them all.
Happy to share the STL files with anyone who wants to print their own. I use ASA for strength and UV stability but if you sanded and painted the exterior plenum PLA would be just fine too. Tree supports to avoid warping the flat surfaces.
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