Metal Letter Box, Wall Mount Locking Mailbox, Rainproof Newspaper Box, Made of Metal, Lightweight and Weather-Resistant, Flexible and Smooth Rotation, with Key Lock

Swivel chimney end, galvanized swivel smoke extractor, swivel smoke extractor, galvanized smoke extractor cover, stainless steel wind powered swivel smoke extractor for attic, roof, enclosed factory ventilation● Dimensions:11 cm (4 in) including 1 snap ring15 cm (6 in) including 1 snap ring20 cm (8 in) including 1 snap ring25 cm (10 in) including 1 snap ring30 cm (12 in) including 3 fixed feet40 cm (16 in) including 3 fixed feetProduct Name: No power air capMaterial: 304 stainless steel (galvanized internal components)Function: Ventilation and exhaust, ventilation and heat dissipation, blocking foreign matter, anti-blocking

• Rotating Vent Cap: The cap rotates with the action of the wind, so the harder the wind blows, the faster the blades spin, creating a strongers airflow from the inside out.
• Easy to install: the chimney cap is very light, fast, and can be installed by one person, and can be freely operated on a relatively gentle slope to further expand the installation range.
• Various functions: 304 stainless steel roof chimney cap, rainproof, birdproof, zero power consumption, ventilation pipe chimney, exhaust without noise. For roof chimney openings, fireplace vents, pipe protection covers, can be used in villas, apartments, hotels, warehouses, underground garages, canteens.
• Reinforced and Durable: Made of galvanized metal, very lightweight and weather-resistant. It can be easily and quickly installed on the extraction pipe.
• Arc-shaped densely arranged blades: circular blades are densely arranged, the larger the size, the more blades, the greater the exhaust air volume, and the faster the air circulation