Air Flow – It is important to keep dampness in a mushroom barn but stifling conditions often occur,
making it difficult for the air to flow. When growing small amounts of mushroom packs this does not
usually happen as there is enough oxygen. However, since all mushrooms release carbon dioxide,
when there are a lot of packs in a barn the carbon dioxide levels can get too high, which can cause
the mushrooms to wilt, remain small or not even bloom. Therefore, it is necessary to arrange the barn
with an airy bottom-section, since carbon dioxide is heavier than oxygen and will be able to spread
out. For very big mushroom barns, ventilation fans may be needed. The wind flow will take away
some dampness, so in order to compensate, simply water more frequently to keep the mushrooms
fresh.