These filters compare the total volume for yesterday to the average daily volume. 

These filters are a percent value.  If you set the Max Volume Yesterday to 100, you will only see symbols which traded on lower than average volume yesterday.  If you set the Min Volume Yesterday to 100, you will only see symbols which traded on higher than average volume yesterday.  If you set the Min Volume Yesterday to 250, you will only see symbols which traded on at least two and a half times their normal volume yesterday.  If you set the Max Volume Yesterday to 90, you will only see symbols which traded on less than 90% of their normal volume yesterday.