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NOMENCLATURE
© FANTECH
2016
Symbol
Definition
Area
m
2
square metre
Density
ρ
density of air kg/m
2
Dimensions
mm
millimetre
cm
centimetre
m
metre
square
Ø
diameter
Electricity
Amps
amperes
Extd
dust and ignition proof motor
Ex d
flame-proof motor
Ex e
explosion-proof motor
Ex n
non-sparking motor
kW
kilowatt
ph
phase
Ø
phase
Power
P
R
impeller absorbed power, kW
Pressure
kg/m
2
kilogram per square metre
Pa
pascal
kPa
kilopascals
p
d
F
fan dynamic/velocity pressure
p
s
F
fan static pressure
p
t
F
fan total pressure
Sound
dB
decibel
dB(A)
decibel, A weighted
dBW
sound power level, L
w
Hz
frequency, Hertz
L
p
sound pressure level, dB
L
w
sound power level, dB
NC
noise criteria
NR
noise rating
PNC
Preferred Noise Criterion
pW
picowatt
μ
pa
micropascal
Speed of rotation
r/s
revolutions per second
rev/sec
revolutions per second
Temperature
°C
degrees celcius
K
Kelvin, absolute temp.
Time
sec or s
seconds
Velocity
m/s
metres per second
Volumetric flow
L/s
litres per second
m
3
/s
cubic metres per second
q
v
volume flow
Volume
m
3
cubic metres
Weights
wt
weight
kg
kilogram
O
O-15
REFERENCE INFORMATION