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A comment on DIY ventilation heat exchanger (2010). Parent comment
$300 option from Alibaba, http://mistersustainable.blogspot.com/2021/08/another-mini-e...
$700+ options, https://old.reddit.com/r/hvacadvice/comments/wdl0mn/do_windo...
OpenERV design (writeup pending), https://x.com/open_erv
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$300 option from Alibaba, http://mistersustainable.blogspot.com/2021/08/another-mini-e...
$700+ options, https://old.reddit.com/r/hvacadvice/comments/wdl0mn/do_windo...
OpenERV design (writeup pending), https://x.com/open_erv