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2. Sliding door - Wikipedia

   en.wikipedia.org/wiki/Sliding_door

   All top-hung sliding door gear systems have a maximum weight limit per pair of trolley hangers. As the door is hung at the top from two points, it also needs a bottom track/stay roller [5] [clarification needed] to prevent it from swinging sideways. The most common type is called 'clear threshold guiding', a floor-fixed plastic guide about 60 ...

3. Transom (architecture) - Wikipedia

   en.wikipedia.org/wiki/Transom_(architecture)

   Transom windows which could be opened to provide cross-ventilation while maintaining security and privacy (due to their small size and height above floor level) were a common feature of apartments, homes, office buildings, schools, and other buildings before central air conditioning and heating became common beginning in the early-to-mid 20th century.

4. Platform screen doors - Wikipedia

   en.wikipedia.org/wiki/Platform_screen_doors

   The doors form a 2.5 m (8 ft 2 in) high glass and steel screen the entire length of the platform. The door opening is 2.1 m (6 ft 11 in) wide, and the system includes integrated passenger information and digital advertising screens.

5. Interlock (engineering) - Wikipedia

   en.wikipedia.org/wiki/Interlock_(engineering)

   The first form of interlocking security is more mechanical. For example, if an individual is entering a building, there may be two sets of doors to enter from. As the individual enters the first door, that door will close before they enter through the second door. This type of interlocking security can prevent piggybacking or tailgating. The ...

6. Threshold (architecture) - Wikipedia

   en.wikipedia.org/wiki/Threshold_(architecture)

   A worn-out wooden threshold. A threshold is the sill of a door. Some cultures attach special symbolism to a threshold. It is called a door saddle in New England. [citation needed] Door thresholds cover the gap between the floor and the door frame, helping to prevent any water leaks, insects or draughts from entering through the opening.

7. We Tried All The Whipped Toppings To Find The Best One For ...

   www.aol.com/tried-whipped-toppings-best-one...

   Bottle Winner: Kirkland Heavy Whipped Cream. This bottled option had a "classic, milk-sweet flavor without being too sugary," according to one editor who named this brand their favorite.