US Patent 11320158 Multifunctional circulation system enabling purification of outside air

A multifunctional storage system includes a storage chamber and a machinery chamber provided on a side of the storage chamber. The system further includes a dehumidification part dehumidifying circulating air flowing in the storage chamber; a circulating air inlet and a circulating air outlet enabling the storage chamber and the machinery chamber to communicate; and a circulation filter unit supplying moisture to circulating air supplied to the storage chamber via the circulating air inlet.