Merv

This page is about Merv, the oasis-city in Central Asia. For the TV personality, see Merv Griffin, for the Australian cricketer see Merv Hughes.Merv (Russian: Мерв, from Persian: مرو, Merw, sometimes transliterated Marw or Mary; cf. , Mulu), formerly Achaemenid Satrapy of Margiana, and later Alexandria and Antiochia in Margiana (Greek: Αντιόχεια της Μαργιανήs), was a major oasis-city in Central Asia, on the historical Silk Road, located near today's Mary in Turkmenistan. Several cities have existed on this site, which is significant for the interchange of culture and politics at a site of major strategic value. It is claimed that Merv was briefly the largest city in the world in the twelfth century [1]. The site of ancient Merv has been listed by UNESCO as a World Heritage Site.
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Minimum Efficiency Reporting Value, commonly known as MERV Rating is a measurement scale designed in 1987 by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) to rate the effectiveness of air filters.The scale is designed to represent the worst case performance of a filter when dealing with particles in the range of 0.3 to 10 micrometres. Higher MERV ratings correspond to a greater percentage of particles captured on each pass.
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