The optimal solution to have a calm and stable flow over the dryer is to place the receiver before the dryer. Also, the filter should be placed before the dryer but after the receiver. Getting clean air into the dryer extends the dryer's lifetime and will increase your air quality. Ask the customer what the area of use is, for example, instrument air is classified under ISO certification. Talk to your sales responsible if you are unsure how the ISO classing is built up, or read the filter leaflet for advice