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A condensing gas furnace includes a sealed combustion area, combustion draft inducer and a secondary heat exchanger. The primary gain in efficiency for a condensing gas furnace, as compared to a mid-efficiency forced-air or forced-draft furnace, is the capture of latent heat from the exhaust gases in the secondary heat exchanger.
A mercury switch is an electrical switch that opens and closes a circuit when a small amount of the liquid metal mercury connects metal electrodes to close the circuit. There are several different basic designs (tilt, displacement, radial, etc.) but they all share the common design strength of non-eroding switch contacts.
The iPad (6th generation) [4] (also referred to as the iPad 9.7-inch [5]) is a tablet computer developed and marketed by Apple Inc. It was announced on March 27, 2018, during an education-focused event at Lane Tech High School in Chicago [6] and is the successor to the fifth-generation iPad, upgraded with the Apple A10 Fusion processor and support for styluses such as Apple Pencil. [7]
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HVAC turning vanes are sheet metal devices inside of mechanical ductwork used to smoothly direct air inside a duct where there is a change in direction, by reducing resistance and turbulence. See also
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Apple released a security patch for the issue as part of its iOS 10.3.3 update, [120] though older devices running iOS 9, including the iPad 2, 3rd generation iPad, iPhone 4s, the first-generation iPad Mini, and the 5th generation iPod Touch were left without an available update, causing concerns over the safety of the iPad 2, the 3rd ...