Knut Bø FB100 is a matt black decorative front cover for Muro-Style 100/B/T/DS wall and ceiling fans with a 100 mm nominal duct diameter. It replaces the standard grille to align the fan appearance with dark bathroom and utility-room finishes. Fitment matches only the specified Muro-Style series to preserve airflow and control interface. Typical applications include residential bathrooms and utility rooms where an alternative colour is required.