- Quality service: We provide quality products and service and are happy to help with any issues, so you can shop with confidence. 100% customer satisfaction is our goal. If you encounter problems, please email us. - Durable stainless steel: Choose the size by the outer diameter of your chimney. Our chimney caps are made from stainless steel 304, water- and heat-resistant. The robust design prevents frame warping, so it can be used outdoors for years in all weather conditions. - Easy to install: Fully assembled and ready to install. One-person installation saves time and effort, giving you peace of mind for your home and family. Roof vents effectively prevent downdrafts and improve ventilation; includes clamps for attaching to ducts with smaller diameters. - Roof ventilation: The rotating turbine can be installed on roofs, in conservatories, and other areas where air circulation is poor. It features a durable ball-bearing base and starts turning with little wind, operating quietly. No power supply is required to keep fresh air circulating around the space. Typical applications: - Residential roofs and chimneys to improve airflow and prevent downdraft. - Greenhouses, conservatories, and sunrooms needing continuous passive ventilation. - Small-diameter ducted spaces where automatic, wind-driven ventilation is desirable.