[Amps] fans

[carlseye@tampabay.rr.com (carl seyersdahl)]

This may seem strange but I just noticed something I have to wonder about!!
 I'm working on a gla1000 and it just hit me that the fan on the back is
sucking the air out of the unit instead of blowing it into the amp!!!this
doesn't seem right to me , and it's not what I have come to expect of
fans!!!
 Can anyone set me straight on this as to what is best?? The fan is an
ordinary "boxer fan", 115 vac !!  thanks to all!!!!
   carl / kz5ca