Johnny Vac 440H HEPA central vacuum bags (3-pk) - Replaces Nutone 391 & Hoover that use the Nutone 391 bags! It is a direct replacement for the 391 Nutone bags and they trap 99.98% of microsopic dust particles. TheseAJohnny Vac HEPAAreplacement filter bags are the best replacement bags for Nutone central vacuum power unitS GENUINEAJohnny Vac HEPAAreplaement bags! Johnny Vac 440H replacement filter bags - 3/pk 3 Pack!