MARK: What is the part number of the long tall round fan blade cylinder filter, so I can order some? I am having GREAT difficulty finding this elusive part ANYWHERE on the good ol’ fashion internet. I have four of these Honeywell HY-254 fans in my home and they all need to have those cylinders replaced. These are GREAT fans, VERY, VERY QUIET and all new models by competitive companies are loud, rickety & poorly made. This version of honetwell, is by far, the BEST! I will stand by to hear from you. Thank you.