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Mmm. The ventilation may be necessary to prevent heat damage to what's underneath the oven or maybe some components inside.
We have a 15 year old combi oven on top of the old fridge. The fridge top was discoloured from the heat; I checked it when in use and indeed it got very hot.
I took it apart; the fan and all of the ventilation and air guides etc. were covered in a greasy mush. Now it's clean it heats better and the bottom stays much cooler.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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