3 NuTone Central Vacuum Bags-Style 391 Made By Envirocare Technologies Nutone Central Vac bags fits Nutone models CV350, CV353, CV450, CV653 and CV750. Also fits Eureka central vac models CV1004B, CV1804B and CV1601M. Fits vacuums that use CF391 or 391 Filter Bags fits Nutone Advantage Series Classsique Series and 391 Series (not for use with the Advantage CV850)! Fits all models including CV350, CV353, CV450, CV750 except CV850 3 Nutone Central Vacuum Bags Microfiltration by Envirocare 99.7% of all dust particles are captured with Envirocare bags EnviroCare Premium aftermarket Part # 505