Crucial Vacuum 3 Nutone 391 Allergen Vacuum Bags Fits Nutone Central Vacuum Models: CV350, CV352, CV353, CV450, CV653 and CV750, Compare to Part # 391 3 Nutone 391 Allergen Vacuum Bags Compare to Part # 391 Fits Nutone Central Vacuum Models: CV350, CV352, CV353, CV450, CV653 & CV750