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  2. Rheem Manufacturing Company - Wikipedia

    en.wikipedia.org/wiki/Rheem_Manufacturing_Company

    In North America, Rheem and Ruud both manufacture and sell a full line of heating and cooling products for residential and commercial applications, including up to 98.7% annual fuel use efficiency gas furnaces, oil-fired furnaces, up to 20 SEER air conditioners, heat pumps, thermostats, air handlers, package units, and indoor air quality ...

  3. Forced-air gas - Wikipedia

    en.wikipedia.org/wiki/Forced-air_gas

    Gas-fired forced-air furnaces have a burner in the furnace fuelled 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] Each room has an outlet from the duct system, often mounted in the floor or low on the wall – some rooms will also have an ...

  4. NIOSH air filtration rating - Wikipedia

    en.wikipedia.org/wiki/NIOSH_air_filtration_rating

    These HE-marked filters are 99.97% efficient against 0.3 micron particles and are oil-proof, and therefore their filter-media material has the exact same specification as a P100 filter. [9] [10] [11] Since filters are tested against the most penetrating particle size of 0.3 μm , an APR with a P100 classification would be at least 99.97% ...

  5. Wratten number - Wikipedia

    en.wikipedia.org/wiki/Wratten_number

    Wratten numbers are a labeling system for optical filters, usually for photographic use comprising a number sometimes followed by a letter. The number denotes the color of the filter, but is arbitrary and does not encode any information (the 80A–80D are blue, the next filters in numerical order, 81A–81EF, are orange); letters almost always ...

  6. Anthracite - Wikipedia

    en.wikipedia.org/wiki/Anthracite

    Anthracite, also known as hard coal and black coal, is a hard, compact variety of coal that has a submetallic lustre.It has the highest carbon content, the fewest impurities, and the highest energy density of all types of coal and is the highest ranking of coals.

  7. Thermal power station - Wikipedia

    en.wikipedia.org/wiki/Thermal_power_station

    It is separated from the water inside a drum at the top of the furnace. The saturated steam is introduced into superheat pendant tubes that hang in the hottest part of the combustion gases as they exit the furnace. Here the steam is superheated to 1,000 °F (540 °C) to prepare it for the turbine.

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