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Blocking off those two furnace returns will not impede the operation of that furnace nor will you encounter any overtemp conditions.. Ive been running mine for eight years with those furnace returns blocked off..
You can feel a cold draft coming thru them when the furnace isn't running.. regarding protection of the furnace it has a limit switch mounted on its frame that is NC (normally closed) and completes the electrical circuit to let the furnace run... IF the furnace were to get too hot this limit switch OPENS UP thus breaking the electrical circuit and immediately shuts down the furnace...
That furnace is getting plenty of ambient air from other holes throughout
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