This fly curtain protects from insects flying in, from dust and dirt, without significantly affecting the air circulation when the balcony or patio door is open. Inside the apartment, if you want, you can use it instead of a door. The chain links are made of aluminum and are anodized in a complex process at the manufacturer in the Netherlands. Thus, they retain their luster for years, are UV-stable, weather-resistant as well as corrosion-resistant and even washable if necessary.