When you shop for window and door screens, you’ll see two terms: fly screen and insect screen (often called mosquito screen). Many assume they’re the same, but there are critical differences that affect how well they protect your home – especially in the United States.
This guide explains the differences, which screen is best for different US regions, and how to choose the right mesh material for your climate.
What Is a Fly Screen?
A fly screen is designed to keep out larger insects – houseflies, bluebottles, wasps, moths. Mesh openings are 1.2‑1.5 mm (about 16‑18 holes per inch). It offers excellent airflow and visibility but does not block mosquitoes or tiny biting midges.
What Is an Insect Screen (Mosquito Screen)?
An insect screen uses finer mesh – 0.6‑0.8 mm openings (20‑22 holes per inch). It blocks mosquitoes, gnats, midges, and sandflies. It also reduces dust and pollen. Airflow is slightly reduced (75‑85%) but still very good. For areas with high mosquito pressure or disease risk (West Nile, Zika), an insect screen is the minimum standard.
Which Screen for US Regions?
- Florida, Gulf Coast, Texas: High mosquito pressure. Use insect screen (20‑22 mesh), preferably 304 stainless steel for durability in humidity.
- California, Southwest: Occasional mosquitoes but also flies. Insect screen is the safe choice – it blocks both.
- Northeast & Midwest: Seasonal mosquitoes but also midges in some areas. Insect screen recommended.
- Pacific Northwest: Few mosquitoes but midges. Fine mesh insect screen needed.
- Mountain states (Colorado, Utah, etc.): Flies are the main nuisance; a fly screen may suffice, but insect screen still blocks flies and offers optional UV protection.
Mesh Material Matters
- PET polyester: Affordable, UV‑resistant, soft, good airflow. Best for most windows.
- Fibreglass: Cheap but short‑lived – frays, weakens in sun, and can rust. Avoid for long‑term use.
- 304 stainless steel: Extremely durable, pet‑proof, rust‑proof. Ideal for doors, coastal homes, and areas with high insect pressure.
Cost Comparison (USD)
| Type | Material | Price Range |
|---|---|---|
| Fly screen | PET polyester | $10‑60 |
| Insect screen | PET polyester | $15‑80 |
| Insect screen | 304 Stainless Steel | $30‑200+ |
Installation Types
- Adhesive velcro screens: Cheapest, no tools, removable – good for renters.
- Fixed frame screens: Durable, permanent – ideal for windows opened infrequently.
- Retractable screens: Roll up when not needed – perfect for living rooms and kitchens.
- Folding (concertina) screens: For wide doors – slides sideways, covers large openings.
Conclusion
For most US homes, an insect protection screen is the better investment – it keeps out both flies and mosquitoes. Invest in 304 stainless steel for doors, high‑traffic areas, or coastal climates. MBORMC makes custom screens in any mesh size and material – contact us for a free quote with your exact window dimensions.
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