ʻĀpana haʻahaʻa haʻahaʻa hale hoʻolaʻa wela me kahi mea hoʻololi wela kiʻekiʻe (a hiki i 90%) e hoʻolako mau i ka ea wela hou i loko o nā wahi noho.
Me kahi ERV, hiki iā ʻoe ke hoʻopaʻa i nā puka makani a paʻa ka ea me ka hopohopo ʻole i ka maikaʻi o ka ea o loko no ka mea hiki iā ia ke mālama i ka ea ma o ka hoʻolako ʻana i ka ea o waho me ka hoʻopau ʻana i ka ea o loko.
Ke hoʻokomo ka ERV i ka ea hou me ka mālama ʻana i ka mahana a me ka haʻahaʻa i loko o kahi ākea i hoʻopaʻa ʻia, hoʻoheheʻe ia i ka ʻike ʻana o nā mea maʻi maʻi i ka lewa me kahi kānana e hoʻoneʻe i ka ea palau i ka wā e hoʻololi ai ka ea.
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