Nilfisk makes several great vacuums that keep particulate matter from going airborne. Nilfisk vacuums utilize advanced HEPA filtration that traps 99.9% of all dust. We use the variable speed Nilfisk w/HEPA filter in our Special Collections, and it has been a wonderful tool. Many conservators recommend this vacuum for use in museum/library collections. For more info, please see the Nilfisk site: http://www.pa.nilfisk-advance.com/VacuumCleaners/default_specialty.htm