Posted for "Alan K. Adamson" <aadamson@highrf.com>:

 I posted this awhile back, but figured it was applicable to this thread.
 The test for "differential" pressure to test the effectiveness of the
 baffles is not done with "static" pressure, it's done with an ASI with  one
 port connected to tubing on the pressure side of the baffle/plenum and the
 other port connected to the "return" or exit side of the baffle/plenum.
 
 http://rv7-a.com/phase_1_page2.htm#1/15/05
 
 Alan