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  2. Forced-air gas - Wikipedia

    en.wikipedia.org/wiki/Forced-air_gas

    Older furnaces sometimes relied on gravity instead of a blower to circulate air. [1]Gas-fired forced-air furnaces have a burner in the furnace fueled by natural gas.A blower forces cold air through a heat exchanger and then through duct-work that distributes the hot air through the building. [2]

  3. Forced-air - Wikipedia

    en.wikipedia.org/wiki/Forced-air

    Requires less energy than electric resistance heating and possibly more efficient than fossil fuel fired furnaces (gas/oil/coal). Air source types may not be suitable for cold climates unless used with backup (secondary) source of heat. Newer models may still provide heat when coping with temperatures below 0 °C (32 °F).

  4. Anaerobic digester types - Wikipedia

    en.wikipedia.org/wiki/Anaerobic_digester_types

    Comparison of common AD digester technology types. The following is a partial list of types of anaerobic digesters.These processes and systems harness anaerobic digestion for purposes such as treatment of biowaste, animal manure, sewage and biogas generation. [1]

  5. Upflow anaerobic sludge blanket digestion - Wikipedia

    en.wikipedia.org/wiki/Upflow_anaerobic_sludge...

    Upflow anaerobic sludge blanket (UASB) technology, normally referred to as UASB reactor, is a form of anaerobic digester that is used for wastewater treatment. The UASB reactor is a methanogenic (methane-producing) digester that evolved from the anaerobic clarigester .

  6. Furnace (central heating) - Wikipedia

    en.wikipedia.org/wiki/Furnace_(central_heating)

    These furnaces were still big and bulky compared to modern furnaces, and had heavy-steel exteriors with bolt-on removable panels. Energy efficiency would range anywhere from just over 50% to upward of 65% AFUE. This style furnace still used large, masonry or brick chimneys for flues and was eventually designed to accommodate air-conditioning ...

  7. World juniors USA vs. Finland: How to watch hockey gold-medal ...

    www.aol.com/world-juniors-usa-vs-finland...

    How to stream USA vs. Finland world juniors hockey game. Fubo and Sling carry NHL Network in the United States. Today's world juniors hockey games. All times p.m. ET. Sweden vs. Czechia, 3:30.

  8. Georgia QB Carson Beck suffered elbow injury in SEC title ...

    www.aol.com/sports/georgia-qb-carson-beck...

    Georgia quarterback Carson Beck suffered an elbow injury during Saturday's SEC Conference championship against Texas and is looking into treatment options, the school confirmed in a release on ...

  9. Trickling filter - Wikipedia

    en.wikipedia.org/wiki/Trickling_filter

    Some of the latest trickle filter technology involves aerated biofilters of plastic media in vessels using blowers to inject air at the bottom of the vessels, with either downflow or upflow of the wastewater. [8]

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