
P a g e 7 4 • D R I - S T E E M D e s i g n G u i d e
D R I - S T E E M D e s i g n G u i d e • P a g e 7 5
humidistat — a regulatory device, actuated by changes in humidity;
used for automatic control of relative humidity
humidity transmitter — a monitoring device that senses humidity
level and provides an output signal based on humidity level
HVAC — heating, ventilation, air conditioning
hygrometer — an instrument responsive to humidity conditions of
the atmosphere
Hz — hertz
I
IAQ — indoor air quality
ID — inside diameter
in — inch, inches
in
2
— square inch(es)
in
3
— cubic inch(es)
IOM — Installation, Operation and Maintenance manual
I-P units — inch-pound units
J
J — joule
JIC — Joint Industrial Council
K
kW — kilowatt
kWh — kilowatt-hour
K
VS
— valve flow coefficient, Europe
L
L — litre
lb — pound
lbs/hr — pounds per hour
lbs/hr/ft — pounds per hour per foot (as in vapor hose capacity)
lbs/hr/ft
2
— pounds per hour per square foot
LON — local operating network
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