Air Exchange Heat Recovery
thingiverse
This is a DIY air exchange with heat recovery that I'm using in my chicken coop. I'm using a DHT-22 humidity sensor to monitor the humidity and this system has a dual flow (inter/outer) tubes that recover the heat as the air is exchanged. Uses 6 inch PVC drain waste pipe and a 3.5 aluminum inter tube for the counter flow heat exchanger. How this was made video: https://www.youtube.com/watch?v=LfzsId0iecA
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