UV Resistant Seal Disk is used to prevent swirl. Parag Fans & Cooling Systems Limited manufactures UV Resistant Seal Disk. Parag Fans & Cooling Systems Limited is an ISO 9001-2000 awarded Company that supplies Energy efficient Axial Flow Fan, Fan Rings and Grids and Fill Hungers. UV Resistant Seal Disk is optionally segmented for ease in handling. It is also useful for easy transportation. Each segment of Seal Disk Is moment balanced. The Seal Disk comes in one piece statically balanced form.