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Abbreviations and Letter Symbols

Aapproach*
acfmactual cubic feet per minute*
altaltitude*
ambambient*
ampampere
atmatmosphere
azazimuth
bar.barometer
bhpbrake horsepower
BtuBritish thermal unit
CWTcold water temperature*
cu ftcubic foot
cu incubic inch
cfmcubic feet per minute (see acfm, scfm)
dBdecibel
Fdegree Fahrenheit
diamdiameter
DBTdry bulb temperature*
elelevation
fbmfeet board measure (board feet)
fpmfeet per minute
fpsfeet per second
ftfoot
gpmgallons per minute (U.S. liquid measure)
hphorsepower
HWThot water temperature*
hrhour
ininch
IDinside diameter
kw kilowatt
kwhrkilowatt hour
lin ftlinear foot
mphmiles per hour
ODoutside diameter
ppmparts per million
lbpound
lb per cu ftpounds per cubic foot
lb per hrpounds per hr*
psiapounds per square inch absolute
psigpounds per square inch gage*
Rrange (cooling range)*
Rcrecirculation percent*
RHrelative humidity*
rpmrevolutions per minute
secsecond
shpshaft horsepower
sp grspecific gravity
sq ftsquare foot
stdstandard
scfmstandard cubic feet per minute*
temptemperature
velvelocity*
WBTwet bulb temperature*