why, is there a size problem
lots of under cabinet options, most come with or have kits for front exhaust
when i replaced the GE MW/convection in the Safari the new GE could be configured for rear vent or front exhaust, it was no problem to setup and install
i tool a tape measure and went to home depot found the correct size GE MW and bought it
I can explain it to you.
But I Can Not understand it for you !
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1997 F53 Bounder 36s