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Vent Axia 563501C Humidiswitch . Operates Vent-Axia ventilating units on either a rise or a fall in humidity to control the damaging effects of condensation. . Setting range 20% to 80% RH. . Designed for use with controllers with 'Auto' mode facility. . Single pole changeover contacts. . Vent Axia Stock Ref. No. 56 35 01C |