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Merv
Merv
(, ,
Marv
), formerly
Achaemenid
Satrapy
of
Margiana
, and later
Alexandria
(Ἀλεξάνδρεια) and
Antiochia in Margiana
, was a major
oasis
-
city
in
Central Asia
, on the historical
Silk Road
, located near today's
Mary
in
Turkmenistan
.
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Minimum efficiency reporting value
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
.
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