Plan the piping installation from the BEAM power unit to the inlet valves. It's best to run the piping under the floor if possible. In structures without basements, the piping may be run through the attic or crawlspaces. In an existing two- or three-story home, vacuum piping may be run to upper levels through cold air ducts, through the back of closets or under stairways, or beside a soil pipe. In new structures, pipe can be run through wall studs before drywall is applied. Be sure to plan where to locate the BEAM power unit — usually in the garage or basement.