CADXChange HVAC symbol library (DWG)
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167 symbols as AutoCAD blocks, drawn in millimetres at 1:1. Plain DWG (AutoCAD 2018 format), no add-in needed.
The symbols are drawn after common HVAC drafting conventions; there is no single standard for them, so the library is not certified against any standard.
Check your office or client drafting standard before you rely on a shape.

Conventions
- One block per symbol, named HV_<NAME>, all geometry on layer SYMBOL, drawn at real size in millimetres (1 drawing unit = 1 mm, INSUNITS = millimetres).
  Insert them at scale 1 in model space; the catalog in model space and the CATALOG layout show them at 1:100.
- Air terminals, fans, air handling units, room units and plant: plan view, the insertion point is the centre of the symbol.
- Duct fittings: double-line plan symbols with the insertion point on the duct centre line at the start; the run goes along +X. Dampers and duct accessories are drawn on a 600 mm wide duct piece.
- Pipe services are 2000 mm samples (line style and label) and valves are small schematic symbols with the insertion point at the left pipe connection; copy them along your pipe.
- A visible tag (terminal, duct, equipment or valve tag) sits next to the symbol; capacities, sizes, ratings, manufacturer and model are invisible attributes shown in the attribute editor
  (EATTEDIT, or double-click the block) and in exports, so equipment, diffuser and valve schedules can be exported with BlockSync.
- Marks and tags (terminal tag, duct size, pipe tag, elevation, room load) are sized for 1:100: text height 250 mm. Scale them with your drawing scale.
- Model space holds a catalog of all symbols; the CATALOG layout shows it on one sheet and can be plotted to PDF.
- To count the symbols or list their attributes in many drawings, export the blocks to Excel with BlockSync: https://cadxchange.net/blocksync

Symbols
Air terminals
  HV_DIFF_SQ_4WAY                  Square diffuser, 4-way
  HV_DIFF_SQ_3WAY                  Square diffuser, 3-way
  HV_DIFF_SQ_2WAY                  Square diffuser, 2-way opposite
  HV_DIFF_SQ_2WAY_CORNER           Square diffuser, 2-way corner
  HV_DIFF_SQ_1WAY                  Square diffuser, 1-way
  HV_DIFF_ROUND                    Round ceiling diffuser
  HV_DIFF_SWIRL                    Swirl diffuser
  HV_DIFF_PERFORATED               Perforated face diffuser
  HV_DIFF_LINEAR_1SLOT             Linear slot diffuser, 1 slot
  HV_DIFF_LINEAR_2SLOT             Linear slot diffuser, 2 slots
  HV_DIFF_LINEAR_3SLOT             Linear slot diffuser, 3 slots
  HV_DIFF_DISPLACEMENT             Displacement diffuser, wall mounted
  HV_NOZZLE_JET                    Jet nozzle, long throw
  HV_GRILLE_SUPPLY                 Supply grille
  HV_GRILLE_RETURN                 Return grille
  HV_GRILLE_EXHAUST                Exhaust grille
  HV_GRILLE_TRANSFER               Transfer grille
  HV_GRILLE_FLOOR                  Floor grille
  HV_GRILLE_DOOR                   Door louvre / grille
  HV_GRILLE_LINEAR_BAR             Linear bar grille
  HV_HOOD_KITCHEN                  Kitchen exhaust hood
  HV_CAP_EXHAUST                   Exhaust cap, round

Ducts and fittings
  HV_DUCT_RECT                     Rectangular duct, double line
  HV_DUCT_ROUND                    Round duct, double line
  HV_DUCT_SINGLE                   Duct, single line
  HV_DUCT_FLEX                     Flexible duct
  HV_ELBOW_RADIUS                  Elbow 90 degrees, radius
  HV_ELBOW_MITRE                   Elbow 90 degrees, mitred with vanes
  HV_TEE_BRANCH                    Branch tee, rectangular
  HV_TAKEOFF_ROUND                 Round branch take-off from rectangular duct
  HV_REDUCER                       Reducer, concentric
  HV_REDUCER_ECCENTRIC             Reducer, eccentric
  HV_DUCT_RISE                     Duct rise (up)
  HV_DUCT_DROP                     Duct drop (down)
  HV_DUCT_THROUGH_FLOOR            Duct through floor (shaft)
  HV_DUCT_CAP                      Duct end cap
  HV_DUCT_INSULATED                Duct, insulated
  HV_CONN_FLEXIBLE                 Flexible duct connection
  HV_FLOW_SUPPLY                   Supply air arrow
  HV_FLOW_RETURN                   Return air arrow
  HV_FLOW_EXHAUST                  Exhaust air arrow
  HV_FLOW_OUTSIDE                  Outside air arrow

Dampers and duct accessories
  HV_DAMPER_VOLUME                 Volume damper, manual
  HV_DAMPER_MOTORISED              Motorised damper
  HV_DAMPER_FIRE                   Fire damper
  HV_DAMPER_SMOKE                  Smoke damper
  HV_DAMPER_FIRE_SMOKE             Combined fire and smoke damper
  HV_DAMPER_BACKDRAFT              Backdraft damper
  HV_DAMPER_PRESSURE_RELIEF        Pressure relief damper
  HV_LOUVRE_WALL                   Louvre in wall
  HV_SILENCER                      Duct silencer / attenuator
  HV_ACCESS_DOOR                   Duct access door
  HV_DUCT_FILTER                   Filter in duct
  HV_DUCT_COIL_HEATING             Heating coil in duct
  HV_DUCT_COIL_COOLING             Cooling coil in duct
  HV_DUCT_HEATER_ELECTRIC          Electric duct heater
  HV_DUCT_HUMIDIFIER               Steam humidifier in duct

Fans
  HV_FAN_AXIAL                     Fan, axial in duct
  HV_FAN_INLINE                    Fan, inline duct (round)
  HV_FAN_CENTRIFUGAL               Fan, centrifugal
  HV_FAN_ROOF                      Fan, roof exhaust
  HV_FAN_CEILING                   Fan, ceiling exhaust
  HV_FAN_WALL                      Fan, wall mounted
  HV_FAN_JET                       Jet / impulse fan

Air handling and heat recovery
  HV_AHU_SIMPLE                    Air handling unit, simple
  HV_AHU_SECTIONED                 Air handling unit with sections
  HV_AHU_ROOFTOP                   Rooftop packaged unit
  HV_AHU_ERV                       Energy recovery ventilator
  HV_HEAT_WHEEL                    Heat recovery wheel
  HV_HRV_PLATE                     Plate heat recovery exchanger
  HV_PLENUM                        Plenum / mixing box

Room and terminal units
  HV_FCU_CASSETTE                  Fan coil, ceiling cassette 4-way
  HV_FCU_DUCTED                    Fan coil, concealed ducted
  HV_FCU_WALL                      Split indoor unit, wall mounted
  HV_FCU_FLOOR                     Fan coil, floor standing
  HV_UNIT_HEATER                   Unit heater
  HV_RADIATOR                      Panel radiator
  HV_CONVECTOR                     Trench / wall convector
  HV_AIR_CURTAIN                   Air curtain
  HV_VAV_BOX                       VAV terminal box
  HV_VAV_REHEAT                    VAV terminal box with reheat coil
  HV_FPB_BOX                       Fan powered terminal box
  HV_SPLIT_OUTDOOR                 Split outdoor unit
  HV_VRF_OUTDOOR                   VRF outdoor unit
  HV_HUMIDIFIER                    Humidifier, room / free standing
  HV_DEHUMIDIFIER                  Dehumidifier

Plant
  HV_CHILLER_AIR                   Air-cooled chiller
  HV_CHILLER_WATER                 Water-cooled chiller
  HV_COOLING_TOWER                 Cooling tower
  HV_DRY_COOLER                    Dry cooler / fluid cooler
  HV_BOILER                        Boiler, gas / oil fired
  HV_BOILER_ELECTRIC               Boiler, electric
  HV_HEAT_PUMP                     Air-to-water heat pump
  HV_PUMP_CIRC                     Circulating pump
  HV_PUMP_BASE                     Base-mounted pump with motor
  HV_PUMP_TWIN                     Twin pump (duty / standby)
  HV_TANK_EXPANSION                Expansion vessel
  HV_AIR_SEPARATOR                 Air separator
  HV_TANK_BUFFER                   Buffer / storage tank
  HV_CALORIFIER                    Calorifier / storage cylinder with coil
  HV_HX_PLATE                      Plate heat exchanger
  HV_HX_SHELL                      Shell and tube heat exchanger

Pipe services
  HV_PIPE_CHWS                     Chilled water supply
  HV_PIPE_CHWR                     Chilled water return
  HV_PIPE_HWS                      Heating hot water supply
  HV_PIPE_HWR                      Heating hot water return
  HV_PIPE_CWS                      Condenser water supply
  HV_PIPE_CWR                      Condenser water return
  HV_PIPE_GLY                      Glycol
  HV_PIPE_REF_LIQUID               Refrigerant liquid
  HV_PIPE_REF_SUCTION              Refrigerant suction gas
  HV_PIPE_CONDENSATE               Condensate drain
  HV_PIPE_STEAM                    Steam
  HV_PIPE_STEAM_COND               Steam condensate return
  HV_PIPE_MAKEUP                   Make-up water
  HV_PIPE_GAS                      Fuel gas

Valves and pipe accessories
  HV_VALVE_GATE                    Gate / isolation valve
  HV_VALVE_GLOBE                   Globe valve
  HV_VALVE_BALL                    Ball valve
  HV_VALVE_BUTTERFLY               Butterfly valve
  HV_VALVE_CHECK                   Check valve
  HV_VALVE_BALANCING               Balancing valve
  HV_VALVE_PICV                    Pressure independent control valve
  HV_VALVE_CONTROL_2WAY            Control valve, 2-way, motorised
  HV_VALVE_CONTROL_3WAY_MIX        Control valve, 3-way mixing
  HV_VALVE_CONTROL_3WAY_DIVERT     Control valve, 3-way diverting
  HV_VALVE_SOLENOID                Solenoid valve
  HV_VALVE_SAFETY                  Safety / relief valve
  HV_VALVE_REDUCING                Pressure reducing valve
  HV_VALVE_EXPANSION               Thermostatic expansion valve
  HV_STRAINER                      Y strainer
  HV_FLEX_CONNECTOR                Flexible pipe connector
  HV_EXPANSION_JOINT               Expansion joint
  HV_PIPE_REDUCER                  Pipe reducer
  HV_FLOW_METER                    Flow meter
  HV_METER_ENERGY                  Energy (BTU) meter
  HV_GAUGE_PRESSURE                Pressure gauge
  HV_GAUGE_TEMPERATURE             Thermometer
  HV_AIR_VENT                      Automatic air vent
  HV_VALVE_DRAIN                   Drain valve with hose end
  HV_STEAM_TRAP                    Steam trap

Controls and sensors
  HV_THERMOSTAT                    Room thermostat
  HV_HUMIDISTAT                    Room humidistat
  HV_SENSOR_TEMP_ROOM              Room temperature sensor
  HV_SENSOR_HUMIDITY_ROOM          Room humidity sensor
  HV_SENSOR_TEMP_HUMIDITY          Room temperature and humidity sensor
  HV_SENSOR_CO2                    Room CO2 sensor
  HV_SENSOR_OCCUPANCY              Occupancy / motion sensor
  HV_SENSOR_TEMP_DUCT              Duct temperature sensor
  HV_SENSOR_HUMIDITY_DUCT          Duct humidity sensor
  HV_SENSOR_TEMP_PIPE              Pipe temperature sensor
  HV_SENSOR_PRESSURE_DUCT          Duct static pressure sensor
  HV_SENSOR_DP                     Differential pressure sensor
  HV_SENSOR_AIRFLOW                Airflow measuring station
  HV_SWITCH_FLOW                   Flow switch
  HV_SWITCH_FREEZESTAT             Freeze protection thermostat
  HV_DETECTOR_SMOKE_DUCT           Duct smoke detector
  HV_ACTUATOR_DAMPER               Damper actuator
  HV_CONTROLLER_DDC                DDC controller
  HV_DRIVE_VFD                     Variable frequency drive
  HV_PANEL_CONTROL                 Control / starter panel

Marks and tags
  HV_TAG_TERMINAL                  Air terminal tag (type / airflow)
  HV_TAG_EQUIPMENT                 Equipment tag
  HV_TAG_DUCT_SIZE                 Duct size tag
  HV_TAG_PIPE                      Pipe tag (size / service)
  HV_TAG_ELEVATION                 Duct / pipe elevation mark
  HV_TAG_ROOM_LOAD                 Room load / airflow tag

Free to use and modify in your own projects, including commercial ones. Provided as is, without warranty.
https://cadxchange.net/resources/symbol-libraries/hvac-symbols
