It sounds like you're asking about insect screens for windows and doors. Insect screens are mesh coverings made of materials like fiberglass or metal that are placed over windows and doors to keep insects out while allowing air to flow through. Here's some information on them:

**Types of Insect Screens:**

1. **Fiberglass Screens:** These are the most common type of insect screens. They are affordable, flexible, and easy to install. Fiberglass screens are also resistant to corrosion and won't stain.

2. **Aluminum Screens:** Aluminum screens are more durable than fiberglass and can withstand harsh weather conditions. They are also available in various colors to match your window frames.

3. **Stainless Steel Screens:** These screens offer the highest level of durability and are resistant to corrosion. They are a good option for areas with extreme weather or where there's a need for extra security.

**Benefits of Insect Screens:**

- **Insect Protection:** Screens keep out mosquitoes, flies, and other insects, allowing you to keep your windows and doors open without worrying about bugs getting inside.

  

- **Improved Airflow:** You can enjoy fresh air indoors without letting in insects or debris.

  

- **Privacy:** Screens provide some level of privacy by obstructing the view from outside, especially during daylight hours.

**Installing Insect Screens:**

- **DIY Installation:** Many insect screens come with installation kits and can be easily installed by homeowners. They typically involve attaching the screen frame to the window or door frame using screws or adhesive.

- **Professional Installation:** For custom or large window screens, professional installation might be preferred to ensure a perfect fit and long-lasting performance.

**Maintenance:**

- **Regular Cleaning:** Clean your screens regularly to remove dust, pollen, and other debris. Use a vacuum or a soft brush to gently clean the mesh.

- **Repair Damages:** If you notice any tears or holes in the screen, repair them promptly to prevent insects from getting through.

Insect screens are a practical addition to any home, especially in areas with a lot of bugs or during the warmer months when you want to keep your windows open. They come in various sizes and styles to suit different types of windows and doors. If you're considering installing insect screens, you can find them at most hardware stores or through window and door suppliers.