Many dustless companies connect their sanders to tubing that carries the dust to bags outside, thanks to vacuums mounted on trailers. Others use indoor vacuums equipped with filters that trap even the extremely fine particles that cause the most lung damage. To locate these contractors, start with the "find a professional" service on the National Wood Flooring Association's website, woodfloors.org Then call a few companies and ask what equipment they use, as well as the questions you'd use to screen any contractor, such as how much experience they have and whom they list as references.
Hire someone who is certified: Hiring a company with good equipment will go a long way toward minimizing dust.
If you need to move furniture and other items: Storing them in a room that won't be sanded makes sense. To minimize dust, close doors and cover gaps under doorways with towels rolled into snake shapes. Cover doorways that you will need to use with zippered plastic, such as ZipWall ZipDoor Commercial Door Kit for Dust Containment, $36 on Amazon.com.
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