At, we do our best to use standardized nomenclature to describe our products. Frequently we also use abbreviations to describe product details. If the terminologies and/or abbreviations used on this site are confusing or unclear, we hope this glossary of acronyms, abbreviations and terms will help. Glossary of Acronyms, Abbreviations and Terms

~ Tilde Sign: Used to indicate an estimate, i.e. ~7 min =  approximately 7 minutes
± Plus-Minus Sign: Indicates the precision of an approximation, i.e. ±5°F = plus or minus 5 degrees Fahrenheit
< Less Than Sign
Less Than or Equal To Sign
> Greater Than Sign
Greater Than or Equal To Sign
' Apostrophe: Foot/Feet, i.e. 5'
" Quotation Mark: Inch/Inches, i.e. 11"
° Degree Sign (angle or temperature)
A Amperage. Also abbreviated as "amp."
ACFM Actual Cubic Feet per Minute. See "Fill Time (CFM/ACFM)."
amp Amperage. Also abbreviated as "A."
Ar Argon
bar Metric Unit of Pressure (1 bar = 14.5 psi)
C Centigrade (Metric)
cc/min Cubic Centimeters per Minute
CFM Cubic Feet per Minute. See "Fill Time (CFM/ACFM)."
CGA Compressed Gas Association
Charging Rate The rate at which a compressor fills a tank/cylinder. Usually expressed in CFM/ACFM, SCFM and L/min.
cm Centimeter/Centimeters
CO Carbon Monoxide
CO2 or CO2 Carbon Dioxide
cSt Centistrokes
cu ft Cubic Feet
Cv Valve Flow Coefficient
dB Decibels
DIN German Institute for Standardization (Deutsche Institut für Normung e.V.)
DIN Rail A standardized metal rail used to mount electrical components inside of equipment racks. DIN rails are used in some Nuvair equipment.
E1 Single Phase [electrical power]
E3 Three Phase [electrical power]
EAN or EANx Enriched Air Nitrox
EANx32, EANx36, etc. Enriched Air Nitrox, i.e. EANx40 = 40% oxygen
EN European Standard
F Fahrenheit (Imperial)
FAD Free Air Delivery
Fill Time (CFM/ACFM) Fill time based on filling an 80 cu ft tank from 0 to 3000 psi. (Calculation: 80 ÷ CFM/ACFM Rate = CFM/ACFM Fill Time)
Fill Time (SCFM) Fill time based on filling an 80 cu ft cylinder from 500 to 3000 psi. (Calculation: 80 ÷ SCFM Rate x 0.8333 = SCFM Fill Time)
FNPT Female National Pipe Thread
ft Foot/Feet
g Gram/Grams
g/L Grams per Liter
gal Gallon/Gallons
H2S Hydrogen Sulfide
He Helium
hp Horsepower
Hz Hertz
I.D. or ID Inner (interior) diameter of a tube, pipe, or hose
in Inch/Inches
inHg Inches of Mercury (vacuum)
ISO International Organization for Standardization
kg Kilograms
kgf/cm2 Kilogram-force per square centimeter 
kW Kilowatt
L Liter/Liters (Litre)
L x W x H Dimensions of a Product: Length x Width x Height
L/min Liters per Minute
lb Pound/Pounds [Weight]
m Meter/Meters (Metre)
m3/h Cubic Meters per Hour [volume]
mA Milliamp
mAh Milliamp Hours
min Minute/Minutes
mL Milliliter/Milliliters
mm Millimeter/Millimeters
MNPT Male National Pipe Thread
mV Millivolt/Millivolts
N2 or N2 Nitrogen
NFPA National Fire Protection Association
Nitrox A gas mixture of nitrogen (N2) and oxygen (O2). Also referred to as: Enriched Air Oxygen, Oxygen Enriched Air, EAN, and EANx.
O2 or O2 Oxygen
OCA Oxygen Compatible Air
O.D. or OD Outer diameter of a tube, pipe, or hose
oz Ounce/Ounces in Volume or Weight
PNEUROP European association of manufacturers of compressors, vacuum pumps, pneumatic tools and air & condensate treatment equipment
ppm Parts per Million
psi Pounds per Square Inch: Imperial Unit of Pressure (100 psi = 6.89 bar)
qt Quart/Quarts
rh Relative Humidity
RoHS Restriction of Hazardous Substances
RPM Revolutions per Minute
SCBA Self-Contained Breathing Apparatus
SCFM Standard Cubic Feet per Minute. See "Fill Time (SCFM)."
SCUBA or scuba Self-Contained Underwater Breathing Apparatus
SKU Stock Keeping Unit: Used as Nuvair's product identification number (part number)
V Volt
VAC Volts of alternating current
Wh Watt-Hour
Zero Air Specially polished Grade E air that contains less than 0.1 ppm of hydrocarbon impurities.