The Carpet and Rug Institute (CRI) has certified several Tennant and Nobles products into its Green Label Program. The Tennant models that have been certified are the 3000/3050 portable back-pack vacuum, 3220 dual motor upright vacuum, 3400 canister vacuum, and the 6100 Rider Sweeper. The Nobles models that are certified under the Green Label program are the Pathmaker, Viper, Tidy-Vac, and the Portapac.