Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!
This is an
AMP page - Open full page! for all features.
the most efficient way to navigate the Engineering ToolBox! Commonly used HVAC abbreviations
A - compressed air line or area ABC - above ceiling AC - air chamber, alternating current A/C - air conditioning AFF - above finished floor AFG - above finished grade AL - aluminum AMB - ambient AMP - ampere ARR - arrangement ATC - automatic temperature control, at ceiling ATM - atmosphere AUTO - automatic AUX - auxiliary AVG - average BBD - boiler blowdown BF - boiler feed BHP - boiler horsepower, brake horsepower BOD - bottom of duct BOP - bottom of pipe BOT - bottom BP - back pressure B & S - bell-and-spigot BSMT - basement BTU - British thermal unit BV - butterfly valve oC - degrees Celsius C - condensate line C to C - center to center CA - compressed air CAL - calorie CAP - capacity CD - condensate drain CF - chemical feed, cubic foot CFH - cubic feet per hour CFM - cubic feet per minute CI - cast iron CIRC - circular CL - center line CM - centimetre CM 2 - square centimetre CO - clean out COL - column CONC - concrete, concentric CONN - connect, connection CONT - continuation CPVC - chlorinated polyvinyl chloride CR - condenser return CRW - chemical resistant waste CS - condenser supply CTR - center CU - cubic CU FT. - cubic feet CU IN. - cubic inches CV - check valve CW - cold water CWR - cold water riser D - drain, deep DB - dry bulb DDC - direct digital control DEG - degree DELTAT - temperature difference DET - detail DIA - diameter DISC - disconnect DN - down DP - dew point temperature DR - drain DWG - drawing EA - exhaust air, each EAT - entering temperature EATR – Exhaust Air Transfer Ratio - to identify the amount of exhaust air transferred to inlet air in an energy recovery ventilator E to C - end to center EER - energy efficient ratio EFF - efficiency EJ - expansion joint EL - elevation ELB - elbow ELEC - electrical ENT - entering ERV – Energy Recovery Ventilator ESP - external static pressure ET - expansion tank EVAP - evaporator EWT - entering water temperature EXH - exhaust EXP - expansion EXST - existing EXT - external oF - degrees Fahrenheit F - Fahrenheit FC - flexible connector, flexible connection FCO - floor clean out FD - floor drain FDW - feed water FEC - fire extinguisher cabinet FF - finish floor FG - finish grade FHC - fire hose cabinet FLA - full load amps FLR - floor FM - flow meter FO - fuel oil FOV - flush out valve FPM - feet per minute FPS - feet per second FS - flow switch, federal specs FT - foot, feet FTG - fitting FU - fixture unit FV - flush valve G - gram, gas line GA - gauge GAL - gallons GALV - galvanized GL.V - globe valve GND - ground GPD - gallons per day GPH - gallons per hour GPM - gallons per minute GPS - gallons per second GR - grain GV - gate valve GWH - gas water heater H 2O - water HB - hose bibb HD - head Hg - mercury HGT - height HMD - humidity HORIZ - horizontal HP - horsepower HR - hour HRV – Heat Recovery Ventilator HTD - heated HTR - heater HW - hot water HWH - hot water heater HWR - hot water return, hot water riser HWS - hot water supply HWT - hot water tank HZ - herts ID - inside diameter IN. - inch INHg - inches of mercury INSUL - insulation INT - international INTL - internal IPS - iron pipe size IV - indirect vent IW - indirect waste J - joule K - kelvin KG - kilogram KM - kilometre KM 2 - square kilometre KPA - kilo pascal KS - kitchen sink KW - kilowatt L - length, liter LAT - leaving air temperature LB. - pound LBF - pound-force LIQ - liquid LP - low pressure LRA - locked rotor amps LVL - level LVR - louver LWT - leaving water temperature M - meter M 2 - square meter M TYPE - lightest type of rigid copper pipe MAN - manual MAT - mixed air temperature MAX - maximum MBH - thousand British thermal units per hour MFR - manufacturer MG - milligram MGD - millions gallons per day MIN - minimum or minute ML - milliliter MM - millimetre MM 3 - cubic millimetre MPT - male pipe thread MTD - mounted MU - make up NA - not applicable NC - normally closed NEG - negative NIC - not in contact NO - normally open NPHP - name plate horsepower NPS - nominal pipe size NPSH - net positive suction head NTS - not to scale O - oxygen OA - outside air OAT - outside temperature OC - on center OD - outside diameter OED - open end duct OF - overflow OV - outlet velocity OZ. - ounce PA - pascal PC - plumbing contractor PCR - pumped condensate return PD - pressure drop PF - power factor PG - pressure gauge PL - plate PNEU - pneumatic PRESS - pressure PROP - propeller PRV - pressure reducing valve PSI - pounds per square inch PSIA - pound per square inch absolute PSIG - pound per square inch gauge PV - plug valve QTY - quantity RA - return air RAD - radius RAT - return air temperature RD - roof drain R/E - return and exhaust RECOV - recovery RED - reducer REF - reference RH - relative humidity REQD - required REV - revision RL - refrigerant liquid RLA - Rated Load Amperes RM - room RS - refrigerant suction RTN - return RV - relief valve S - switch SA - shock absorber, supply air SAT - supply air temperature SCH - schedule SDT - saturated discharge temperature SEC - seconds, secondary SENS - sensible SEP - separate SEQ - sequence SER - series SERV - service SF - service factor SHT - sheet SI - international systems of units SOL - solenoid SP - static pressure SPEC - specification SQ. - square SQ.FT. - square feet SS - stainless steel SSH - static suction head SST - saturated suction temperature STD - standard STH - static total head STL - steel SUCT - suction SPLY - supply SV - service SVH - static velocity head SW - service weight SWS - service water TD - temperature difference TDH - total dynamic head TEMP - temperature TH - thermometer THK - thick TP - total pressure TSP - total static pressure UF - under floor UH - unit heater V - vent, volt, volume VAC - vacuum VAV - variable air volume VB - vacuum breaker VCI - vacuum cleaning inlet VCL - vacuum cleaning line VEL - velocity VERT - vertical VIB - vibration VOL - volume VSD - variable speed drive VP - velocity pressure VTR - vent thru roof W - watt, width, wide WB - wet bulb WCO - wall clean out WG - water gauge WH - water heater
Related Topics Related Documents
Search Engineering ToolBox
the most efficient way to navigate the Engineering ToolBox! About Engineering ToolBox!
We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.
Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.
Google Privacy & Terms for more information about how you can control adserving and the information collected.
AddThis Privacy for more information. ≡
Learn more Got it!