Lux in tenebris
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Vayshan =) think about it. What volume of cold air will be inside the system unit when air is blown in and when air is blown out? (In a closed space, taking into account the physics of the *fan*'s operation).
Евангелие от Иоанна, 1.5: Lux in tenebris lucet, et tenebrae eam non comprehenderunt. Свет во тьме светит, и тьма не объяла его.