Most high-end air purifiers are powerful enough to circulate the air indoors and trap the floating pet hair. You just need to choose a model that fits the size of the room. Choose a model with the most suitable air filter for pets, a true HEPA filter or HEPA-type, to get the best results in removing all the pet dander and hair out of the atmosphere of your house. These filters are capable of capturing particles as small as 0.3 microns.
However, these air purifiers are only capable of reaching the hairs flying in the air, not the hair on your shirt or the one on your couch upholstery. So be sure to vacuum your carpets and furniture regularly as well.