Pressure fluctuations in your cool cell as a result of cooling or weather conditions can cause leaks and lead to the addition of O2. A flexible air buffer is therefore vital. Pressure changes as a result of refrigeration or weather conditions, for example, are balanced out by using a flexible air buffer (‘lung’). The buffer is made of a durable, flexible and multi-layer PU film. Each storage area is fitted with its own buffer. Air buffers are sized on the basis of the volume of a storage cell and are available in volumes of 2 — 12 m3.