BillA,
Tis the season- Bill if you would like I could run a system resistance curve and a couple of PQ curves on my Flow chamber to give you a baseline to work your set up.
Normally I get several huindreds of dollars an hour for this,
but if you pay for shipping I will donate an hour or two to the cause.
I test to AMCA 210-85 and am accurate up to 400 cfm