DIY ventilation heat exchanger

[kostas]

Originally Posted by pladijs

But one of the reasons I am a bit afraid of going for a counter flow version is that it would be harder to clean....

Sorry to answer you now, have been quite busy at work lately!
About cleaning, I think the best thing to do is installing at least a basic polyester filter, a specific HRV/ERV or furnace filter would be better. If you frame the plates like I did (forget the plywood caps, I'll change that with two metal sheets per core) you can wash the whole HX by immersing it to a tank of warm water and some mild soap. For a coplete sanitation add some specific detergent and rinse.

Originally Posted by pladijs

Kostas, hope you are reading this, is it me, or is there a difference in the height of your cores in the inital pictures you sent and the latest ones? seems like they shrunk? is there a reason for that? Could just be my eyes of course.

Yes, I shrunk them by accident using my atom shrinker!
Just kidding, the small cores you see are the first ones I built to do some testings to see the aforementioned differences between the various materials and configurations. Once rejected the PP distanced version and confirmed the equality between PP and aluminum sheets I decided to use all the material I had and made up the two big cores I'm currently using in the HRV.