This item has been used by us since new for the past two years to dry timber and is in very good condition with many years useful life ahead of it. It would be useful for anyone who needs to remove moisture from storage areas at low temperatures. It works by absorbing the moisture in the air and removing the warm moist air through a 75mm duct. The dry air is returned to the storage room or area where the unit is located, where flexible 130mm ducting can be used to maximise air circulation. Flexible ducting is not included with this listing but is available if needed.