The Helios FDS 250/315 Purlin Box features a convenient hinge mechanism for easy installation and maintenance of roof fans and ventilation hoods on flat roofs. It supports horizontal mounting of RD roof fans with inclinations up to 25°. Made from corrosion-resistant glass-reinforced polyester (GRP), the box includes abrasion-resistant insulation that provides effective sound and heat protection. It ensures a snow-proof base height for reliable performance in winter conditions. The package comes with fastening screws, profile rubber, and sealing materials to guarantee a secure and weather-tight connection between the base and the base plate. This purlin box is an ideal solution for long-lasting, efficient roof fan installations.