This type of door seal utilizes dense bristles, typically nylon or similar synthetic materials, attached to a backing strip. The bristles create a flexible barrier against the door jamb or threshold, effectively sealing gaps and preventing air infiltration, drafts, and the ingress of dust, insects, and moisture. An example includes the thin strip of brush-like material often found beneath a garage door.
Effective sealing contributes significantly to energy efficiency by reducing the load on heating and cooling systems. It also enhances indoor comfort by minimizing drafts and stabilizing interior temperatures. Historically, simpler forms of gap sealing, such as felt or foam, predate this more advanced bristle-based approach. This modern method provides a superior, longer-lasting seal due to the flexibility and resilience of the bristles.