Do Fly Screens block the Light?
Not really. There are some very tightly woven screens that do block some light, but most are barely noticeable. The whole point of a flyscreen is to let air and light in while keeping insects out.
As flyscreens do not block light they do not block UV, so do not rely on them to protect form sunburn.
Do Fly Screens keep out all insects?
Pretty much all insects are kept out by a flyscreen Very tight screens are sometime used for fruit-flys, but this is not a big problem.
Why use a retractable fly screen?
Insects are not a problem all year around. You can roll away flyscreens when not in use, which is more than half the year. The retractable screen is conveniently with the window for when it is needed next summer.
What are the types of retractable insect screen?
Screens can slide to one side of the window, or roll away above the window. These re sometime part of the windows’ original design, sometime designed latter to a window that was installed at an earlier date.
There are also magnetic screens that simply attach to the metal frame of the window. When not used they are stored elsewhere. This is convenient unless you are prone to losing the screen.
What is cleaning like?
Quite easy; flyscreens are easier to clean than windows. Detachable screens can be cleaned with soapy water. Many screens can simply be vacuumed with a soft attachment. If cleaning is gently there is hardly ever an issue.
Are Pets an Issue?
Younger pets, like kittens, can be an issue. If you are worried you can purchase tougher screens designed to be pet proof. Or you can spray citrus juice or a commercial animal repellent on a surface to deter animals. Google the animal in question and use what is appropriate.
Are there tougher types of flyscreen?
Yea, though nothing is indestructible. The type of screen used on security doors is very tough. Its only disadvantage is that, being rigid, it cannot be made retractable.
It is also possible to fit a metal grill over a flyscreen. This is much more secure and animals tend not to climb it. Again, it cannot be easily removed.