R model in the figure. In the L model, the parts are mirrored.
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Extract air fan (behind the protective cover)
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Supply air fan (behind the extract air duct)
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Fine filter for supply air
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Heat recovery cell
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Bypass flap
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Coarse filter for supply air
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Coarse filter for extract air
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Post-heating radiator (behind the extract air duct)
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Safety switch
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Control panel
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Carbon dioxide sensor
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Humidity sensor
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Internal humidity sensor