304 Stainless Steel Material: The wall ventilation grille is made of thick 304 stainless steel, which is very durable, waterproof, sturdy, corrosion resistant, pressure resistant, not easily deformed and cracked, providing better performance and longer service life. Hemispherical Housing: The Air Vent is designed with a hemispherical housing and a stainless steel grille inclined at 45°, which prevents rain and wind from entering the ventilation system, as well as other animals such as mice and birds from nesting there. Avoid blocking the passages. Easy Installation: The air vent cover is easy to install, disassemble and clean. It has a built-in hook on the side, which can be fixed by pushing the air vent cover into the holes and wedging the built-in hook into the ventilation holes. (Please wear gloves to protect your hands during installation). Scope of application: Qrity 160mm air vent is suitable for 160mm wall holes and 160mm aluminum tubes. They are used for hood exhaust and