Fly screens are a great way to keep out flies and other small insects while still allowing air to flow freely into the home. They are relatively inexpensive and easy to install, making them a popular choice for many homeowners. Fly screens can be effective at keeping out flies and other small insects, but they have a few limitations. For example, they can’t keep out large flying insects like bees and wasps. They also don’t work as effectively at night, since many flying insects are attracted to light. Additionally, if there are any gaps or holes in the fly screen, they won’t be able to keep out the insects. Overall, fly screens are an effective way to keep out many types of flying insects. However, they may not be the best choice for large insects or those that are attracted to light. It is also important to make sure that the fly screen is intact and free from any gaps or holes in order for it to be fully effective.