is a door that is designed to prevent the passage of air through its edges, joints, or other openings. Airtight doors are commonly used in buildings to improve energy efficiency, reduce drafts, and prevent the infiltration of outdoor pollutants. They can also be used in laboratory or industrial settings to prevent the spread of hazardous materials or to maintain a controlled environment. Airtight doors may be made from a variety of materials, including wood, steel, or aluminum, and may be fitted with weatherstripping, gaskets, or other sealing devices to improve their airtightness.

Airtight doors typically have several features that help to make them effective at preventing the passage of air:

Tight-fitting door: Airtight doors are designed to fit tightly within their frames to prevent air from passing through gaps.

Pressure relief vents: These vents allows the pressure inside the room to be equalized with the outside, avoiding any damage to the door or frame.

Commercial buildings: Airtight doors are commonly used in office buildings, retail spaces, and other commercial buildings to improve energy efficiency and reduce drafts.

Pharmaceutical and medical facilities: Airtight doors are used in these facilities to maintain a sterile environment and prevent the spread of infectious diseases.