How Mosquitoes Get Through Screens
WouterUsing screens to keep mosquitoes out of your home can be a good way to protect your family. However, you must know the type of screen that is best for you. You also need to know how to apply screens.
There are two main types of screens: a cone-based screen and a cylinder-based screen. The cone-based screen has a varying number of cones, each with a different base diameter. It also has a varying height. The mesh size is also a determining factor. The longer the filaments, the more effective the screening.
The screen performance index is calculated by using a formula. The ratio of the number of mosquitoes passing through the permissive side to the number passing through the non-permissive side is then measured. The results are presented as a percentage. The higher the SP index, the better the performance of the screen.
The cone-based screen with the highest SP index was the C04 screen. It had a maximum height of 9 mm and a cone base to height ratio of 1.3. It had a 5 mm pore at the apices of the cone. It also had a minimum permissiveness of 20% and a maximum permittedness of 53 percent.
The cylinder-based screen had a diameter of 7 mm, which blocked most of the mosquitoes’ passage through the screen. The diameter and the height of the cylinders were the determining factors for the performance of the screen. The cylinders were designed to allow 0 percent of the mosquitoes to escape.
