Steve -
Where did this info come from?  If from your company internally, it is time to
call the oven manufacturer to come out and service your oven.  If it came from
the oven manufacturer, it is time to consider getting a new oven. , I think it
is the former.
One of the key tests I use when evaluating reflow ovens is load testing.  The
oven must perform the same regardless if there is one board in it or a
constant load of boards.
Most present day convection dominant ovens are "load capable" with good heat
transfer capacity.  I hope the HVN is one of them.  What you are doing is
totally unnecessary with the majority of ovens that I have tested.  Definitely
contact the manufacturer as soon as possible.
Regards,

Phil Zarrow
ITM, Inc.

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