Product review (1 stars): Do not use with Honeywell HCM-6009 series. Old filter ...
Do not use with Honeywell HCM-6009 series. Old filter is 7.5 inches high; the Protec is only 5 inches high. I had to stretch the circular portion of the Protec filter to fit into the humidifier; this filter is meant for a smaller humidifier. I threw them out!.