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2. Airlock - Wikipedia

   en.wikipedia.org/wiki/Airlock

   An airlock on board the Space Shuttle. An airlock [a] is a room or compartment which permits passage between environments of differing atmospheric pressure or composition, while minimizing the changing of pressure or composition between the differing environments.

3. Mantrap (access control) - Wikipedia

   en.wikipedia.org/wiki/Mantrap_(access_control)

   Entrance to HM Prison Edinburgh. A mantrap, security mantrap portal, airlock, sally port or access control vestibule is a physical security access control system comprising a small space with two sets of interlocking doors, such that the first set of doors must close before the second set opens.

4. Air-supported structure - Wikipedia

   en.wikipedia.org/wiki/Air-supported_structure

   Air-supported dome used as a sports and recreation venue. An air-supported (or air-inflated) structure is any building that derives its structural integrity from the use of internal pressurized air to inflate a pliable material (i.e. structural fabric) envelope, so that air is the main support of the structure, and where access is via airlocks.

5. Air door - Wikipedia

   en.wikipedia.org/wiki/Air_door

   A typical commercial air curtain enclosure. In North America, the more commonly-used term for an air door is "air curtain". The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) defines an air door as follows: "In its simplest application, an air curtain is a continuous broad stream of air circulated across a doorway of a conditioned space.

6. Door security - Wikipedia

   en.wikipedia.org/wiki/Door_security

   Solid wood doors withstood more force than the very common metal skinned wood-edged doors used in newer construction. A broad range door manufacturer, Premdor (now Masonite) once stated in one of its 1990s brochures entitled "Premdor Entry Systems" page 6 that "The results of tests were overwhelming, Steel edged doors outperform wood-edged ...

7. Double dump valve - Wikipedia

   en.wikipedia.org/wiki/Double_dump_valve

   Double dump valves have two trap-door flap plates which open and close on an alternating cycle. The top gate opens to allow collected material to drop through onto the bottom gate. The top gate then re-closes to prevent air leakage above the valve. The bottom gate then opens to allow material to pass completely through the valve.

8. Airlock (disambiguation) - Wikipedia

   en.wikipedia.org/wiki/Airlock_(disambiguation)

   An airlock is a chamber with two air-pressure-tight doors for moving between areas of different air pressure. Airlock or air lock may also refer to: Air lock, an obstruction of liquid flow in pipes; Airlock (parachute), a safety device; Airlock (band), a Belgian trip hop group; Airlock, an action game for the Atari 2600

9. Space Systems Processing Facility - Wikipedia

   en.wikipedia.org/wiki/Space_Systems_Processing...

   The Space Systems Processing Facility (SSPF), originally the Space Station Processing Facility, is a three-story industrial building at Kennedy Space Center for the manufacture and processing of flight hardware, modules, structural components and solar arrays of the International Space Station, and future space stations and commercial spacecraft.