Made from engineered polymers, our Stratus Diffusers are designed to outperform and outlast comparable metal diffusers. In fact, this revolutionary plastic product wont rust, fade or corrode due to its unique properties. Features. Meets UL 2043 Fire Rating. Wont rust, corrode or fade. Dishwasher safe. Never needs painting. Indistinguishable from metal when installedSpecifications. Certifications UL94HB. Color White. Diffuser Style Cone. Duct Size 6 in.. Length 233/4 in.. Material Plastic. Neck Size 6 in.. Width 223/4 in.. Country of Origin United States