anything better? * F) ?( w: ]1 H% ]0 ?* P: S. | % Q, Q0 z! w" D% J! y) l2 ]7 Z, r2 jI 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.