TermDefinition
4BOBFour-Bearing Outboard centrifugal blower design with impellers mounted on shaft supported by two bearing brackets at each end of the machine housing
4BOHFour-Bearing Overhung centrifugal blower design with impellers mounted on overhung shaft supported by two-bearing cast iron bracket
AerationBlower process of forcing air bubbles into a pool of liquid
Air BleedIntroduction of air into a centrifugal machine to prevent surge
Air GateGuillotine style on/off valve
ARRISAbrasion-Resistant Removable Inlet Section. An option for Spencer separators used when collecting abrasive materials such as sand, glass, metal, fiberglass, circuit board dust
AyrJet®Registered trademark for Spencer’s High Efficiency, High Speed Turbo Blower
Bag-In/Bag-OutCartridge filter separator for hazardous materials. Cartridges are inserted and removed via plastic bags to minimize worker exposure to collected dust
Bag ShakerSeparator accessory that allows filter bags to be shaken clean after shutdown. Can be manual or motor operated
Ball Float ShutoffLiquid separator device that cuts off vacuum and airflow if liquid level exceeds collector capacity
Blast GateButterfly valve that limits air passing through a blower or vacuum producer to prevent overload
Cams and LeverMechanism that raises and lowers a separator dirt can
CFMA non-scientific measurement denoting cubic feet per minute
Chic HoseSpencer lightweight, wire-reinforced vacuum cleaner hose
Cork PadsRectangular pads supplied with Spencer fabricated machines, used under the machine feet as a leveling aid
DebridgerSeparator accessory for unclogging a hopper during discharge
DeflectorStationary circular fabrication with vanes mounted between rotating impellers to direct air from the tip of one blower impeller to center of the next rotating impeller
Dirt Can LinerHeavy-gauge polyethylene bag for Spencer removable dirt cans. Facilitates removal of collected material
DO ControlsDissolved Oxygen system that regulates air introduction into a wastewater basin by monitoring the oxygen content
Double Mechanical SealNon-contacting seal used with purge gas to greatly minimize detectable leakage in a multistage centrifugal blower where the rotating shaft enters or leaves the housing
E ValveVacuum system inlet valve used for exposed tubing systems
EMBCElectronic Modulating Bleed Control. Allows a blower to bleed off excess air or a vacuum producer to ingest air to avoid surge
Energy Watcher®Monitors CarVac™ vacuum system use and automatically reduces speed during slow periods and ramps up during high period use.
Equalizing LineA Spencer option for separators with removable dirt can (RDC). Allows use of plastic bag liner by equalizing vacuum above and below the collection bag
ExhausterA blower being used as a vacuum producer
Explosion relief bungSeparator accessory that vents excess pressure caused by an explosion
FanRotating impeller inside a blower or single stage scroll blower with motor
FastVac®Registered Trademark for a Spencer line of mobile and stationary vacuum units.
Filter socksCylindrical, fabric filter bags with one sealed end
FlapperVacuum inlet valve with self-closing cover used to connect vacuum cleaning hose to tubing system
Flexible CouplingConnection between drive motor and blower/vacuum producer; must be aligned at job site to assure vibration-free operation
Flexible JointRubber inlet sleeve that isolates a vacuum producer or blower from a tubing/piping system
Fluidized BedA blower process involving aeration of a bed of powdered material causing it to exhibit fluid properties
GasCube®Registered Trademark for Spencer’s Natural Gas Booster Skid Packages
Gland ExhausterBlower used to vacuum escaping steam from a rotating shaft
Gulper ToolLarge diameter tool used to vacuum up large quantities of material, sometimes mixed with air for aeration purposes
Hastelloy®Highly durable material used to fabricate multistage blowers with properties exceeding stainless steel
Heresite®Highly durable coating that protects internal blower parts from corrosion
Housing DrainOptional device for centrifugal blowers; allows liquids to drain from machine. One drain supplied for each stage
HermeticA blower design with the motor sealed inside the housing. The Spencer UL Listed Natural Gas Booster is a hermetic design
ICFMInlet Cubic Feet Per Minute. Air volume measured at the inlet to a blower or vacuum producer. Depending upon altitude/barometric pressure, temperature and humidity, the air density will vary from SFCM conditions
Immersion SeparatorSpecially designed separator in which air and materials are filtered through a water reservoir
ImpellerRotating, air moving component inside a centrifugal blower, usually made of aluminum
Inches HgUnits of vacuum measurement by a mercury manometer. One inch of mercury vacuum equals 13.59″ water column vacuum
Inches WCUnits of vacuum measurement by a water manometer. 13.59″ water column vacuum equals 1.0″ Hg
Industravac®Registered trademark for Spencer self-contained stationary and mobile vacuum cleaning systems
Isomode PadsCushioning squares of synthetic material normally supplied for use under Industravac units in lieu of cork pads
Jet-Clean®Registered trademark for Spencer’s jet pulse separator
Jet PulseA term describing cleaning separator filter bags or cartridges with timed pulses of compressed air
ManifoldA arrangement of tubes or pipes which distributes air or gas to multiple ports
Organ BlowerBlower supplying air for pipe organs
OrgobloSpencer centrifugal blower supplying air for pipe organs
Peak To PeakA measurement indicating vibration or whipping of a rotating shaft, measured in mils. Spencer blowers vibrate less than 1.5 mils peak to peak at 3,500 RPM
Power Mizer®Registered Trademark for Spencer cast centrifugal blowers.
PSIAPounds per Square Inch Absolute. Pressure measurement in reference to nominal sea level atmospheric pressure of 14.7 PSIA. A blower producing an outlet pressure of 17.7 PSIA at sea level is creating a differential of 3 PSI
PSIGPound per Square Inch Gauge. A measurement of the pressure differential a blower can produce. A blower produces 5.7 PSIG at sea level and an inlet temperature of 70°F
Python HoseSpencer vinyl, wire-reinforced vacuum cleaning hose with smooth surfaces inside and out
Radial InletA blower or separator inlet with the centerline of the intake tube in line with the centerline of the cylindrical machine
RDCRemovable Dirt Can, available up to 7-1/2 cubic feet/55 gallons for Spencer separators
Return ChannelSee Deflector
Rhino HoseSpencer rubber, wire-reinforced vacuum cleaning hose
RTDResistance Temperature Device, an accessory usually mounted on a blower to monitor the bearing temperature
RTVRoom Temperature Vulcanizing. Refers to a specialized caulk used between separator sections in lieu of gaskets
SCFMStandard Cubic Feet Per Minute. Air volume measured at 68° F at barometric pressure of 29.92 (sea level) and 36% relative humidity.  Air weight is .075 pounds per cubic foot
Shrink SleeveHeat shrinkable sleeve used to seal joints in tubing systems
SOHStandard overhung design of centrifugal blowers with impellers mounted on the motor shaft
Stuffing BoxOlder seal type used to reduce leakage in a fabricated blower where a rotating shaft passes through the housing
SurgePotentially destructive phenomenon that occurs during low airflow conditions through a centrifugal blower or vacuum producer, noted by a churning or pulsing sensation
Tangential InletSeparator inlet which joins the separator body on a tangent. Promotes centrifugal airflow and rapid material separation
Top Drum®Registered Trademark for a line of Spencer separator.
Top Hat® SeparatorTrademarked Spencer centrifugal separator, installed on a 55-gallon drum to collect debris before a primary separator
Tufflex HoseSpencer flexible, easy-to-handle hose used for general vacuum cleaning
V-Jet™Trademark for a line of Spencer Industravac® vacuum systems
VacometerA Spencer flow measurement device, also known as Globe Vacometer, consisting of a globe with inlet valve connector, adjustable orifice plate and vacuum gauge. Used to measure vacuum and flow through a given orifice to verify vacuum system performance
VellumoidA wood-fiber-based gasketing material used between mating metal parts
Vortex®Registered Trademark for Spencer’s line of regenerative (side channel) blowers.
Water LegSeparator accessory that allows liquid to drain from a wet collector without a pump
Water Trap®Registered Trademark for Spencer’s special separator for the car care industry.
WheelRotating fan, fan blade or impeller inside machine housing
WWTWaste Water Treatment. A market that utilizes Spencer blowers and controls to aerate wastewater lagoons
XP BungExplosion relief port that dissipates the force of an explosion within a separator