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What Screen to Use to Keep Flies and Gnats Out at Night?

Feb. 20, 2025

Flies and gnats can be a nuisance, especially at night when they are drawn to artificial lights. To effectively keep these pests out while allowing fresh air to circulate, choosing the right screening material is essential. In this comprehensive guide, we explore the best screen options, their benefits, and how to maximize protection against these pesky insects.

 

Why Standard Screens May Not Be Enough?

 

Many homes are equipped with standard window and door screens, but not all screens are designed to keep out the smallest flying insects. While traditional fiberglass and aluminum mesh screens are effective against larger insects, gnats and tiny flies can often squeeze through the openings. Choosing the right mesh size and material is key to ensuring complete protection.


aluminum mesh screens 


Best Types of Screens for Keeping Flies and Gnats Out

 

1. No-See-Um Screens (20x20 or Finer Mesh)

No-See-Um screens, also known as high-density insect screens, are specifically designed to block small insects, including gnats, no-see-ums, and midges. These screens typically have a mesh count of 20x20 or higher, meaning there are at least 20 openings per inch in both directions. This finer mesh significantly reduces the chance of tiny bugs infiltrating your home.

 

Benefits of No-See-Um Screens:

- Effective barrier against even the smallest insects

- Durable and long-lasting

- Available in different materials (fiberglass, polyester, and aluminum)

 

2. Stainless Steel Mesh Screens

For those looking for extra durability and strength, stainless steel mesh screens are a great choice. These screens not only keep flies and gnats out but also provide increased resistance against weather conditions, pets, and accidental damage.

 

Advantages of Stainless Steel Screens:

- Highly resistant to rust and corrosion

- Tighter weave options available to block tiny insects

- Stronger than fiberglass or aluminum

 

3. Polyester Insect Screens with UV Protection

Polyester screens offer a long-lasting solution to keeping insects out, with additional benefits such as UV resistance. This makes them an excellent choice for windows, patios, and outdoor enclosures where prolonged sun exposure can deteriorate traditional screen materials.

 

Why Choose Polyester Screens?

- Lightweight and flexible

- Higher UV and moisture resistance

- Available in ultra-fine mesh options

 

4. Magnetic Insect Screens

For those looking for a temporary or removable solution, magnetic screens provide an excellent alternative. These screens attach using magnetic strips or velcro, allowing easy installation and removal. They work well for renters or those who need seasonal protection.

 

Key Features of Magnetic Screens:

- Easy to install and remove

- Available in fine mesh sizes to block small insects

- Suitable for doors and windows

 

Factors to Consider When Choosing an Insect Screen

 

1. Mesh Size and Density

Mesh size is the most critical factor in determining how effective a screen is at keeping small insects out. A 20x20 mesh or finer is ideal for blocking gnats and tiny flies. However, denser meshes may slightly reduce airflow.

 

2. Material Durability

Different materials offer varying levels of durability:

- Fiberglass: Affordable, but prone to tearing

- Aluminum: Stronger, but can dent

- Stainless Steel: Rust-resistant and highly durable

- Polyester: Flexible, UV-resistant, and long-lasting

 

3. Visibility and Airflow

While fine-mesh screens block insects, they may slightly reduce airflow and visibility. Some manufacturers offer high-visibility screens that balance insect protection with clearer outdoor views and optimal air circulation.

 

4. UV and Weather Resistance

If your screens will be exposed to direct sunlight or harsh weather, choose materials that offer UV resistance and weatherproofing. Polyester and stainless steel screens tend to outperform standard fiberglass in longevity.

 

5. Installation and Maintenance

- Permanent Screens: Ideal for year-round protection

- Removable/Magnetic Screens: Suitable for seasonal use

- Maintenance: Regular cleaning prevents dust and debris buildup, ensuring optimal airflow and insect blocking

 

Additional Ways to Prevent Flies and Gnats

 

1. Seal Gaps and Cracks

Even the best insect screens won't be effective if there are gaps around windows and doors. Use weatherstripping and caulking to seal any openings where bugs might enter.

 

2. Use Outdoor Bug Lights

Flies and gnats are attracted to traditional lighting. Consider using yellow bug lights or LED bulbs designed to reduce insect attraction.

 

3. Keep Indoor Lights Dimmed

At night, try to reduce indoor light exposure near windows and doors. Using curtains or blinds can help minimize attraction to insects outside.

 

4. Apply Insect Repellents

For extra protection, you can use natural or chemical insect repellents on screens. Essential oils like citronella, eucalyptus, and peppermint work as natural deterrents.

 

Conclusion

 

Choosing the right screen to keep flies and gnats out at night is essential for maintaining a comfortable, bug-free home. The best options include No-See-Um screens, stainless steel mesh, polyester screens, and magnetic screens, each offering unique benefits. When selecting a screen, consider mesh size, material durability, airflow, and UV resistance to ensure long-lasting protection. Additionally, implementing extra measures like sealing gaps, using insect-resistant lighting, and applying repellents can further enhance your home's defense against unwanted pests.


aluminum mesh screens 


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