Lawe ʻia kēia mau ʻāpana puʻupuʻu pāpaʻi paʻa i loko o ka lumi a ʻaʻole keakea i nā puka makani.Hoʻopili ʻia nā ʻōwili peʻahi e hui pū me ka hapa nui o nā mea hoʻonaninani lumi.Hoʻokomo ʻia nā ʻenehana ʻenehana kiʻekiʻe i ka ʻenehana hou e hāʻawi i ka hana hoʻomaha hilinaʻi ma nā pae kani haʻahaʻa.
ʻO ka hoʻomaikaʻi maikaʻi loa i kāu ʻōnaehana ducted inā hiki ʻole a pāpā ʻia paha ka hoʻohana ʻana i ka hana duct.