PC Fans: Difference between revisions
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<blockquote>If the supply fan is downstream of the cooling coil in a draw-through configuration, the fan heat increases the supply air temperature, increasing the supply air volume required to meet a given space load. If the fan is upstream of the coil in a blow-through configuration, the fan heat is absorbed directly by the coil. In either case, the fan heat adds to the cooling coil load. —James S. Elleson, <i>Cold Air Distribution</i></blockquote> | <blockquote>If the supply fan is downstream of the cooling coil in a draw-through configuration, the fan heat increases the supply air temperature, increasing the supply air volume required to meet a given space load. If the fan is upstream of the coil in a blow-through configuration, the fan heat is absorbed directly by the coil. In either case, the fan heat adds to the cooling coil load. —James S. Elleson, <i>Cold Air Distribution</i></blockquote> | ||
Most motherboard fan headers are rated for between one and two amps. More current than this can be drawn from independently-powered fan controllers. | Most motherboard fan headers are rated for between one and two amps. More current than this can be drawn from independently-powered fan controllers. My personal rule of thumb is to never hook up more than three consumer fans to a single header. | ||
==PWM== | ==PWM== | ||