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Hi Peter. Optimal would be to blow the warmer air over the plate although both systems would work. Remember, you are recirculating the same air trying to reduce it's temp at each pass, shift the BTU's or calories to the TEC cold side so it gets a bit warmer and moves them across to the hot side to be dissipated by the external radiator.. Energy is energy, it's just a different form, heat > electrical.
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