... voltage, high pressure etc.Options:1, Air Pump(Model number with letter"P") Grand mix with more air to a sofer and ... %-90%, save cost of mixture material 2, Pre-cooling system(Model number with letter"M") Separate hopper refrigeration, by separate compressor ... maintain mix below 4.5°C.3, Keep fresh system(Model number with letter"M1") During long nouse periods, the keep ...