In a message dated 8/18/2009 8:40:39 P.M. Eastern Daylight Time,
steveg@abrazosdata.com writes:
"Air Watts:
11" - whatever the hell an Air Watt is!
>From a quick search:
"an engineering unit used to express the effective cleaning power of a
vacuum cleaner or central vacuum system. The air watt is practically the same
as the ordinary _watt_ (http://www.unc.edu/~rowlett/units/dictW.html#watt) .
Measurements of vacuum power, however, are computed from English units
using the following formula established by the American Society for Testing
and Materials (ASTM): power in air watts equals 0.1173547F7S, or very nearly
F7S/8.5, where F is the air flow in the system in cubic feet per minute
(CFM) and S is the suction pressure in _inches of water column_
(http://www.unc.edu/~rowlett/units/dictI.html#inWC) (in WC). This definition
makes the
air watt equal to 0.9983 watt."
Best--Michael Oritt
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