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2. Vacuum pump - Wikipedia

   en.wikipedia.org/wiki/Vacuum_pump

   The Roots blower is one example of a vacuum pump. A vacuum pump is a type of pump device that draws gas particles from a sealed volume in order to leave behind a partial vacuum. The first vacuum pump was invented in 1650 by Otto von Guericke, and was preceded by the suction pump, which dates to antiquity. [1]

3. Vacuum ejector - Wikipedia

   en.wikipedia.org/wiki/Vacuum_Ejector

   A vacuum ejector, or simply ejector, or aspirator, is a type of vacuum pump, which produces vacuum by means of the Venturi effect.. In an ejector, a working fluid (liquid or gaseous) flows through a jet nozzle into a tube that first narrows and then expands in cross-sectional area.

4. Sprengel pump - Wikipedia

   en.wikipedia.org/wiki/Sprengel_pump

   A pump of this type is capable of producing high vacuum in which the pressure is 1 mPa. [1] The Sprengel pump is a vacuum pump that uses drops of mercury falling through a small-bore capillary tube to trap air from the system to be evacuated. [Note 1] It was invented by Hanover-born chemist Hermann Sprengel in 1865 while he was working in ...

5. Rotary vane pump - Wikipedia

   en.wikipedia.org/wiki/Rotary_vane_pump

   An eccentric rotary vane pump Another eccentric rotary-vane pump design. Note that modern pumps have an area contact between rotor and stator (and not a line contact). 1. pump housing 2. rotor 3. vanes 4. spring. A rotary vane pump is a type of positive-displacement pump that consists of vanes mounted to a rotor that rotates inside a cavity. In ...

6. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   Rooftop HVAC unit with view of fresh-air intake vent Ventilation duct with outlet diffuser vent. These are installed throughout a building to move air in or out of rooms. In the middle is a damper to open and close the vent to allow more or less air to enter the space.

7. American Standard Companies - Wikipedia

   en.wikipedia.org/wiki/American_Standard_Companies

   American Standard Companies Inc. was a manufacturer of heating, ventilation, and air conditioning (HVAC) systems, plumbing fixtures, and automotive parts.The company was formed in 1929 through the merger of the American Radiator Company and Standard Sanitary Manufacturing Company forming the American Radiator and Standard Sanitary Corporation.