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Antminer S21 / T21 Silver Industrial Silencer – Pure Copper AC Blower gpu rig T21 and S21hyd hashboardsAntminer S21 T21 Silver Industrial Silencer Pure Copper AC Blower for 120mm Square 4pin Chassis Quiet your Antminer S21 or T21 with the heavy industrial pick silver metal housing, full pure copper AC capacitor motor, 1750 2000 CFM airflow ceiling. Both miners share the same chassis architecture (4 120mm fans on square 4pin connectors) so this single silencer covers both. Bundle includes the matching square 4pin 4 fan simulators for your control board.