FloAire FAV-M - Manual (Page 25)

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If the pressure drop is too low, in fresh and
return air mode, add more blank-off panels to
the burner profile opening and bypass fresh air
and return air damper, which will increase the
pressure drop. (There must be at least 2 inches
of area minimum around the burner.) If the
correct air flow pressure drop is still not
achieved adjust the blower drives to increase
the blowers RPM.
If the pressure drop is too high, in fresh mode
only, remove or adjust the bypass damper
blank-off panels, which will decrease the
pressure drop. The return air damper opening
may need to be adjusted to maintain the correct
air flow pressure drop when switching back to
return air mode.
If the pressure drop is too high, in return air
mode only, remove or adjust the return air
damper and burner profile opening blank-off
panels, and add the blank-off panels to the
bypass damper, which will decrease the
pressure drop.