Minnesota protocol in a nutshell calls for using- if you have a HillRom vest:
6, 8, 9, 18, 19 and 20hz for 5min each. You start at the highest pressure your child can tolerate (turn the vest on to inflate it and gradually increase pressure until you are at the max your child can tolerate comfortably; this is considered 'starting pressure') with the lowest frequencies, and gradually reduce as the frequencies increase. By the time you are done, the pressure is several lower than where you started. In our case, Emily cannot tolerate 20hz, so we do 6, 8, 9, 18 and 19hz for 6min each. She starts at a pressure of 8 and gradually drops.
If you have an InCourage system it's recommended to use the pre-programmed setting that cycles through the recommended speeds and pressures, which will give you the ideal mix to target all airways in the way that his studies show are most effective for that type of vest.