anything better? 9 n4 n. f+ D- b6 i6 j6 A8 } 5 L4 i: }- {& B. I( m7 h6 d' P& zI had the same problem before. I asked the same question and the answers are almost the same. But I think the most effective way is to use the outer cycle, that is, to let the air come in from outside.