Keep bugs out of your space without blocking airflow or light. When choosing a screen, there are two factors that affect airflow and visibility: mesh size and wire diameter. The higher the mesh size, the smaller the holes. The thicker the wire diameter, the sturdier and tougher the screen. 16 × 18 mesh size with a 0.011" wire diameter is the most common combination—it balances good visibility and airflow with durability.

These screens are made with materials that won’t corrode when exposed to weather. Fiberglass screens are easy to install because they’re flexible and won’t crease or dent. However, they tear and fray more easily than metal screens and can be damaged if exposed to harsh outdoor conditions.

20 × 20 mesh size screens have such small openings that tiny insects, such as gnats and sand flies, can’t get through.