Feature: 1. Automatic Silent: This roof ventilator is a dependable rotating, automatic working, continuous and silent operating with maintenance costs. 2. Functional: Designed to release your roof air in just a few minutes, unaffected by rain, suitable for chimneys that are not used frequently. 3. Stainless Steel Material: Stainless steel material is very strong and rustproof. It can also withstand high temperatures and acid and alkali erosion, making it suitable for use in harsh conditions. 4. Sturdy: Premium roof ventilator is sturdy, high durability and ideal for residential or light commercial use. 5. Operating Principle: This chimney hood ring is specially designed to be very effective in preventing wind and increasing ventilation. Specification: Item Type: Roof Ventilator Material: Stainless Steel Specification: 110mm/4.33in Weight: Approx.210g / 7.4oz. Package List: 1 x Roof Ventilator (Total 3 Accessories) Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.