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You can equip the fan with a humidity control system — if the permissible norm is exceeded, the ventilation is turned on automatically, when the norm is reached, it turns off. This will help forgetful to save electricity and not spoil the bathroom or toilet with mold due to constant increased humidity. In the toilet, a fan equipped with a timer will be ideal — the humidity is not high here, but to wait for time to turn off the fan, few people want to turn off it himself.