Seals designed for the space between a pair of entry doors prevent air and moisture infiltration. These barriers come in various materials, including foam, rubber, felt, and metal, each with specific properties suited to different door types and climates. For instance, compression seals expand to fill the gap when the doors close, while v-strips or astragal seals utilize a projecting edge to create a tight barrier against the adjacent door.
Effective sealing significantly enhances energy efficiency by reducing drafts and heat loss. This translates to lower energy bills and a smaller carbon footprint. Moreover, such seals minimize noise transmission and improve indoor air quality by blocking dust, pollen, and insects. Historically, simple felt or fabric strips provided a rudimentary form of sealing. Modern materials and designs offer superior performance, durability, and aesthetic integration.