HVAC Abbreviations
The list of abbreviations used in a set of engineering drawings varies from office to office. Be sure to check the front section of the drawing set for the abbreviations used within.
| A | Air or Compressed Air |
| AC | Air Conditioning |
| ACD | Automatic Control Damper |
| AD | Access Door |
| AF | Air Foil |
| AHU | Air Handling Unit |
| AMP | Ampere |
| AP | Access Panel |
| APD | Air Pressure Drop |
| AS | Air Stream |
| ATC | Automatic Temperature Control |
| ATM | Atmosphere |
| BDD | Back-Draft Damper |
| BHP | Brake Horsepower |
| BI | Backwards Inclined |
| BOD | Bottom of Duct |
| BTU | British Thermal Unit |
| BTUH | BTU per Hour |
| CENT | Center or Centrifugal |
| CF | Cubic Feet |
| CFM | Cubic Feet per Minute |
| CH | Chilled or Chiller |
| CHW | Chilled Water |
| CHWR | Chilled Water Return |
| CHWS | Chilled Water Supply |
| CO | Carbon Monoxide |
| CONN | Connection |
| CT | Cooling Tower |
| CTBD | Cooling Tower Blow Down |
| CUH | Cabinet Unit Heater |
| CWR | Condenser Water Return |
| CWS | Condenser Water Supply |
| D | Drain |
| DB | Dry Bulb (Temperature) |
| DEG | Degree |
| DDC | Direct Digital Control |
| DIA | Diameter |
| DIM | Dimension |
| DP | Differential Pressure |
| EA | Each or Exhaust Air |
| EAT | Entering Air Temperature |
| EF | Exhaust Fan |
| EMER | Emergency |
| EMS | Energy Management System |
| ESP | External Static Pressure |
| ET | Expansion Tank |
| EUH | Electrical Unit Heater |
| EWT | Entering Water Temperature |
| EXH or EX | Exhaust |
| EXT | External |
| EXP | Expansion |
| F | Fahrenheit |
| FA | Free Area or Fire Alarm |
| FC | Flexible Connection |
| FCU | Fan Coil Unit |
| FD | Floor Drain, Fire Damper, or Fire Department |
| FLA | Full Load Amps |
| FLEX | Flexible |
| FLRDR | Floor Drain |
| FPM | Feet per Minute |
| FPS | Feet per Second |
| FRP | Fiberglass Reinforced Plastic |
| FS | Flow Switch |
| FT | Feet |
| FTR | Fin Tube Radiation |
| G | Gas |
| GA | Gauge |
| GAL | Gallons |
| GALV | Galvanized |
| GFU | Glycol Feed Unit |
| GPH | Gallons per Hour |
| GPM | Gallons per Minute |
| GR | Grade |
| HB | Hose Bib (Connection) |
| HD | Head |
| HP | Horsepower or High Point |
| HR | Hour |
| HRU | Heat Recovery Unit |
| HTG | Heating |
| HZ | Hertz (Cycles per Second) |
| ID | Inside Diameter |
| IN | Inches |
| KW | Kilowatt |
| LAT | Leaving Air Temperature |
| LB | Pound |
| LF | Linear Feet |
| LD | Linear Diffuser |
| LP | Low Point |
| LRA | Locked Rotor Amps |
| LUVR, LVR | Louver |
| LVDR | Louvered Door |
| LVG | Leaving |
| LWT | Leaving Water Temperature |
| MAX | Maximum |
| MBH | 1000 BTUH |
| MCA | Minimum Circuit Amps |
| MECH | Mechanical |
| MIN | Minimum |
| MU | Make-Up Water |
| MUA | Make-Up Air |
| NC | Noise Criteria or Normally Closed |
| NO | Normally Open |
| NOM | Nominal |
| OA | Outside Air |
| OAI | Outside Air Intake |
| OC | On Center |
| OD | Outside Diameter |
| ODP | Open Drip Proof |
| OV | Outlet Velocity |
| PCF | Pounds per Cubic Foot |
| PD | Pressure Drop |
| PH | Phase |
| PRV | Pressure Reducing Valve |
| PSI | Pounds per Square Inch |
| PSIA | Pounds per Square Inch - Absolute |
| PSID | Pounds per Square Inch - Differential |
| PSIG | Pounds per Square Inch - Gauge |
| PVC | Polyvinyl Chloride |
| R | Radius |
| RA | Return Air |
| RET | Return |
| RH | Relative Humidity |
| RLA | Running Load Amps |
| RLF | Relief |
| RPM | Revolutions per Minute |
| RTU | Roof-Top Unit |
| SA | Supply Air |
| SCR | Screen |
| SCT | Saturated Condensing Temperature |
| SD | Smoke Detector or Smoke Damper |
| SE | Smoke Exhaust |
| SEN | Sensible |
| SFD | Combination Smoke / Fire Damper |
| SHC | Sensible Heat Capacity |
| SP | Static Pressure |
| SF | Square Feet |
| SS | Stainless Steel |
| SUP | Supply |
| T | Temperature or Thermostat |
| TEFC | Totally Enclosed Fan Cooled |
| TEMP | Temperature |
| TSTAT | Thermostat |
| TON | 12,000 BTUH (Cooling Capacity) |
| TYP | Typical |
| UC | Undercut (Door) |
| V | Volts |
| VAV | Variable Air Volume |
| VD | Volume Damper |
| VEL | Velocity |
| VFD | Variable Frequency Drive |
| WB | Wet Bulb Temperature |
| WC | Water Column |
| WG | Water Gauge |
| WPD | Water Pressure Drop |
| WTD | Water Temperature Difference |
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