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  2. Minimum efficiency reporting value - Wikipedia

    en.wikipedia.org/wiki/Minimum_Efficiency...

    Minimum Efficiency Reporting Value, commonly known as MERV, is a measurement scale designed in 1987 by the American Society of Heating, Refrigerating and Air-Conditioning Engineers to report the effectiveness of air filters in more detail than other ratings.

  3. Heating, ventilation, and air conditioning - Wikipedia

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

    This allows a more granular application of heat, similar to non-central heating systems. Zones are controlled by multiple thermostats. In water heating systems the thermostats control zone valves, and in forced air systems they control zone dampers inside the vents which selectively block the flow of air. In this case, the control system is ...

  4. Air conditioning - Wikipedia

    en.wikipedia.org/wiki/Air_conditioning

    [64] [65] [66] In 1969, the first mini-split air conditioner was sold in the US. [67] Multi-zone ductless systems were invented by Daikin in 1973, and variable refrigerant flow systems (which can be thought of as larger multi-split systems) were also invented by

  5. Yelp - Wikipedia

    en.wikipedia.org/wiki/Yelp

    It has since become one of the leading sources of user-generated reviews and ratings for businesses. Yelp grew in usage and raised several rounds of funding in the following years. By 2010, it had $30 million in revenue, and the website had published about 4.5 million crowd-sourced reviews. From 2009 to 2012, Yelp expanded throughout Europe and ...

  6. Criticism of ESPN - Wikipedia

    en.wikipedia.org/wiki/Criticism_of_ESPN

    ESPN currently charges the highest retransmission consent fee of any major cable television network in the United States. In 2011, the main channel alone carried a monthly rate of $4.69 per subscriber (nearly five times the price of the next-costliest channel, TNT), with ESPN's other English language channels costing an additional $1.13 per subscriber; these prices rise on a nearly constant basis.

  7. 360-degree feedback - Wikipedia

    en.wikipedia.org/wiki/360-degree_feedback

    360-degree feedback (also known as multi-rater feedback, multi-source feedback, or multi-source assessment) is a process through which feedback from an employee's colleagues and associates is gathered, in addition to a self-evaluation by the employee.