If you have a house, it is important that there is proper ventilation throughout your house. It is not enough if you have windows and doors at proper places in your house. You need to keep them open to facilitate proper ventilation in your house.
However, keeping your doors and windows open can present you with another problem. It can let mosquitoes and other irritating bugs into your house.
Magic mesh is something which allows you to keep your windows open without letting any of those mosquitoes and bugs into your house. Magic mesh is also very easy to install and not very expensive.