I'm not sure whether there is a law or whatever. Maybe this is a matter of privacy. I look at the fax machine as I do the mail - do they read each other's mail? If there are separate mail addresses for instance, you might want to extend the partition to the fax machine and bite the bullet and buy an additional machine. I don't have any experience to draw on but just gut instinct. Hope this helps somehow.
Allan D. Virr, CRCM
Allan D. Virr, CRCM,CRP
Compliance Audit Solutions, LLC