The rusting effect of atmospheric moisture on unprotected steel effectively ceases at Relative Humidity (RH) levels below 50% - which is the maximum permitted in our de-humidified store. However, you can have too much of a good thing, and at lower RH levels than this natural materials - leather upholstery, wood trims (and frames of older cars) etc. - suffer from excessive drying out and the possibility of cracking and loss of strength. Therefore our de-humidification systems, engineered by another of our Group Companies specialising in High Technology Semiconductor Production Equipment engineering and environmental regulation systems, utilise museum quality controls to ensure that your car is maintained in the optimum RH regime for arresting deterioration OVERALL - not just crudely drying the air as much as possible. If Dynamic Storage options are not selected, the same regular tyre/battery/leak checks are performed as in Standard Dry Storage.