What feature of doors and windows aids in pest exclusion?

The feature that aids in pest exclusion is found in the use of metal frames and intact screens. Metal frames provide a durable and robust physical barrier that is less susceptible to damage compared to wooden frames. This makes it more difficult for pests to penetrate these structures. Additionally, intact screens serve as a secondary barrier, preventing insects and other small pests from entering the building while still allowing airflow and light without the risk of infestation.

Intact screens are particularly effective at excluding flying insects, which can be a significant concern in both residential and commercial settings. Properly fitted screens that are in good condition can seal the openings in windows and doors tight enough to deter pests, making them an essential feature in pest management strategies.

Wooden frames, while they can provide some exclusion, can warp or deteriorate over time, potentially creating gaps that pests could exploit. Glass doors alone do not provide adequate pest exclusion unless complemented by screens or other preventive measures. Open windows, conversely, are an invitation for pests to enter without any barrier at all. Thus, the combination of metal frames paired with intact screens creates a more effective exclusion strategy against pests.