Premium Material: Constructed from high-quality 304 stainless steel, ensuring exceptional durability and sturdiness. No Power Required: The vent cover operates solely on natural wind, providing effective ventilation without the need for energy sources, thus promoting energy efficiency. High Strength and Wind Resistance: Designed to endure severe conditions, this ventilation outlet can withstand wind speeds of up to 200 km/h and a load pressure of 100KG, guaranteeing no deformation or damage. Versatile Application: Ideal for use on warehouse roofs, greenhouse roofs, workshops, and farm roofs, making it suitable for various environments. Includes Accessories: For pipe sizes ranging from 100mm to 250mm, we provide clamps for secure installation, while for sizes 300mm to 500mm, we offer sturdy fixed feet for enhanced stability. our Unpowered Vent Cap, designed for efficient roof ventilation in various applications such as factory buildings and farms. Crafted from durable 304 stainless steel, this roof ventilator provides a long-lasting solution for exhaust, heat dissipation, and moisture removal. It also protects against rain and backflow, ensuring optimal performance in all conditions. Available in multiple sizes including 100mm, 110mm, 150mm, 160mm, 200mm, 250mm, 300mm, 360mm, 400mm, 450mm, and 500mm, it offers flexibility to meet your specific needs. Installation is straightforward and requires minimal effort. Each package includes one vent cap along with clamps or fixed feet and gloves for your convenience. Please note that manual measurements may have slight variations.