The Helios FDS 710 Purlin Box is designed for the installation of RD series roof fans and ventilation hoods on flat roofs. Suitable for horizontal mounting with up to 25° inclination, this unit features a corrosion-resistant GRP construction with durable, abrasion-resistant insulation that offers effective thermal and acoustic protection. It ensures a snow-proof base height and includes all necessary components for secure installation, including fastening screws, profile rubber, and a sealing system between the base and the base plate. Ideal for professional ventilation setups requiring weather resistance and long-lasting performance.