The dry down evaporator uses compressed gas and heat to evaporate solutions in a range of auto sampler vials and 96 well formatted plates. This is typically used after deprotection to remove the deprotection solution leaving the dried crude oligonucleotide product. Using the blow down method has advantages over a typical centrifugal evaporator in the it is mechanically simple and also more consistent in the time it takes to evaporate a given amount of liquid. The centrifugal evaporators can taking varying amounts of time to evaporate a given amount of liquid based on fluctuations in the vacuum supply. You can almost set your watch by a blown down evaporator.