Airtight doors are designed to enhance air tightness, with the following basic characteristics:

Main Functions

• Isolate Toxic Agents: The primary function of an airtight door is to block the passage of toxic agents, effectively isolating harmful gases and substances from the outside and preventing them from entering indoor spaces.

• Prevent Water Ingress: In specific scenarios, such as in the passageways from underground main substations and main drainage pump rooms to the bottom yard, airtight doors can prevent sudden water ingress.

Materials and Structure

• Materials: Common materials include wood and steel.

• Structure: The door leaf is assembled and welded from components such as flat steel plates, cross-shaped rib plates, and ring beams; the door frame is a framework structure composed of channel steel and I-beam.

Application Scenarios

• Protective Engineering: In civil air defense engineering, airtight doors are installed inside protective airtight doors to prevent toxic agents from entering protected areas.

• Firefighting Field: For example, in the passageways from underground main substations and main drainage pump rooms to the bottom yard, they prevent sudden water ingress.

• Special Facilities: In some special facilities, such as QKB inflatable rapid airtight systems, they are used for fire emergency response, temporary sealing of localized gas accumulation or exceedance, and controlling localized high-temperature fire points, featuring fast construction speed and wide applicability.

Differences from Protective Airtight Doors

• Protective Function: Protective airtight doors can block both shockwaves and toxic agents, while airtight doors can only block toxic agents but not shockwaves.

• Positioning: Protective airtight doors are installed on the outermost side of the external entrances and exits of civil air defense zones and protective units, while airtight doors are installed on the inner side.

• Materials and Weight: Protective airtight doors are typically made of steel and are heavier; airtight doors can be made of steel or wood and are relatively lighter.

Importance

Airtight doors play a significant role in protecting personnel and facilities, especially in preventing the ingress of harmful gases, toxic agents, and water flow. They are indispensable protective equipment in various types of protective engineering and special facilities.