Standard Ductwork Standard Ductwork Fans Sensors and Controllers Schematic Representation Duct air stream size width x depth - Offset (Maximum 15°) - Plug fan - Control wiring Duct S and Drive joint - Pressure regulating valve (PRV) P - Pressure guage 500x400 - HVAC ducting notation and joints - Plate axial fan - Safety valve (SV) 1250L 600L 600L - Rectangular dropping duct section T - Temperature gauge - Drain cock (DC) Duct mez flange joint - Ceiling mounted extract fan Duct segment length P - Pressure sensor - Orifice plate (OP) - Round dropping duct section - Window mounted extract fan Duct construction code if noted (Refer to listing below) - Temperature sensor T - Strainer (STR) 500x400 S/4a - Supply air ducting (SA) - Wall mounted extract fan V - Velocity sensor - Pipe reducer - Rectangular rising duct section H - Humidity sensor - Reduced Pressure Zone / Back flow preventer (RPZ) - Return air ducting (RA) - Wall mounted propeller fan 450x350 R/2 - Humidity high limit sensor - Round rising duct section HH M - Council meter ΔP - Differential pressure sensor - Pressure gauge 500x400 O/1 - Outdoor air ducting (OA) - Ceiling mounted destratification fan - Rectangular duct riser / dropper FS - Flow switch - Binder test point (BT) Grilles and Diffusers 500x400 E/1a - Exhaust air ducting (EA) PS - Pressure switch AVV - Anti-vacuum valve (AVV) - Round duct riser / dropper Air flow direction - Rectangular supply air diffuser (4 way blow) Standard Piping AAV - Automatic air vent (AAV) 500x400 KE/12 - Kitchen exhaust air ducting (KEA) - Plenum box (Internally lined) Pipe nominal bore size Top entry spigot connection Pipe type MBV - Manual bleed valve (MBV) Duct Construction Code (If noted) All pipework drawn to OD size Air flow direction NB200 CHWF 1. Galvanised mild steel - Spigot connection to flexible duct - Floor waste gully (FWG) Max. working pressure: 1=250Pa, 1a=500Pa, 1b=750Pa - Rectangular supply air diffuser (3 way blow) - Piping notation and joints 2. Galvanised mild steel with 25mm internal acoustic insulation. Cushion head box - Pipe cap / end of run Max.working pressure: 2=250Pa, 2a=500Pa, 2b=750Pa Side entry spigot connection Pipe welded joint - 45° Spigot connection to flexible duct Pipe flanged joint 3. Galvanised mild steel with 50mm internal acoustic insulation. Miscellaneous Max. working pressure: 3=250Pa, 3a=500Pa, 3b=750Pa CHWF - Round supply air diffuser - Chilled water flow 4. Galvanised mild steel with 25mm external acoustic insulation. AP - Access panel Max. working pressure: 4=250Pa, 4a=500Pa, 4b=750Pa Ø200 - Flexible duct - Chilled water flow (Single line) 5. Galvanised mild steel with 50mm external acoustic insulation. + HC - Heating coil Max. working pressure: 5=250Pa, 5a=500Pa, 5b=750Pa CHWR - Swirl type supply air diffuser - Chilled water return CC - Cooling coil 6. PVC or similar (rigid) EC - Duct end cap - Max. working pressure: 6=250Pa, 6a=500Pa, 6b=750Pa - Chilled water return (Single line) PTTH - Pitot tube test holes 7. Galvanised mild steel with protective internal coating max. WMS Max. working pressure: 7=250Pa, 7a=500Pa, 7b=750Pa - Wire mesh screen - Linear type supply air diffuser CDWF - Return / Exhaust air flow indicator 8. Aluminium - Condenser water flow Max. working pressure: 8=250Pa, 8a=500Pa, 8b=750Pa - Supply air flow indicator 9. Galvanised mild steel with external fire proofing - Cowl with wire mesh screen - Jet nozzle type supply air diffuser - Condenser water flow (Single line) HVAC Equipment Schedule Abreviations (# = ID number) Max. working pressure: 9=250Pa, 9a=500Pa, 9b=750Pa CDWR AC# - Split system air conditioning unit 10.Proprietary high density sandwich panel - Condenser water return Max. working pressure: 10=250Pa, 10a=500Pa, 10b=750Pa - Cowl (Section) with wire mesh screen - Supply air grille AHU# - Air handling unit 11.Stainless steel - Condenser water return (Single line) BT# - Buffer tank Max. working pressure: 11=250Pa, 11a=500Pa, 11b=750Pa - Return air grille - Round cowl with wire mesh screen LTHWF CT# - Cooling tower 12.Kitchen exhaust - Low temperature hot water flow Max. working pressure: 12=250Pa, 12a=500Pa, 12b=750Pa CH# - Chiller - Outdoor air grille 13.Galvanised mild steel with 12mm internal acoustic insulation. - Bell mouth outlet with wire mesh screen - Low temperature hot water flow (Single line) DA# - Volume control damper Max. working pressure: 13=250Pa, 13a=500Pa, 13b=750Pa - Door grille LTHWR DG# 14. Fabric duct - Exhaust air grille - Low temperature hot water return DP# - Dosing pot In-Line Ductwork Equipment E# - Exhaust air terminal / grille - Uninsulated ductwork - Low temperature hot water return (Single line) - Exhaust air disc valve EAF# - Exhaust air fan - Axial flow fan DR EXP# - Expansion tank - Condensate drain - Externally insulated ductwork FB# - Filter bank - Wall mounted transfer air grilles - Condensate drain (Single line) - Rectangular centrifugal or mixed flow fan FCU# - Fan coil unit MU - Internally insulated ductwork - Make-up water FD# - Fire damper - Wall mounted supply air grille - Mixed flow fan - Make-up water (Single line) HB# - Heater bank KEF# - Kitchen exhaust fan - Round ductwork - Wall mounted return air grille - Refrigerant piping, control and electrical L# - Louvre TL - Centrifugal fan wiring route MCV# - Motorised control valve - Taper (Top Level) - Outdoor air weather louvre 600L - Piping take-off "T" OAF# - Outdoor air fan - Cylindrical sound attenuator complete with pod OU# - Outdoor split system air conditioning unit BL - Exhaust air weather louvre - Piping stab-in "T" P# - Circulating pump 600L - Taper (Bottom Level) - Cylindrical sound attenuator with no pod R# - Return air terminal / grille - Door grille - Piping reducer ET/BW RAF# - Return air fan 600L - Taper (Equal taper / Both ways) S1 - Air terminal identification SA# - Sound attenuator - Rectangular sound attenuator - Piping elbow 100 - Air quantity in l/s SAF# - Supply air fan SL S# - Supply air terminal / diffuser 600L - Taper (Side Level) HVAC Electrical Components - Piping dropper - Filter bank in slide out frame SD# - Smoke damper MDB - Transfer air grille ET - Piping riser T# - Motor control centre / Distribution board General Abbreviations 600L - Taper rectangular to round (Equal taper) - Manual volume control damper - Piping riser VSD - Variable speed drive BMS - Building management system - Three phase isolator (WP = Weatherproof) - Blank flange COS - Check on site - Takeoff shoe - Manual opposed blade damper - Single phase isolator (WP = Weatherproof) CV - Control valve FB - Fullbore drain / Floor waste gulley - Actuator motor EC - Duct end cap - Motorised opposed blade damper - Make-up water point ID - Internal diameter (or dimension) - Radius bend without turning vanes EM - Energy meter MU MOS - Measure on site AH - After hours switch DP - Drain point with "P' trap NC - Normally closed - Back draught / Non return damper Sensors, Controllers and Switches Schematic Representation NO - Normally open - Radius bend with turning vanes T - Wall or ceiling mounted temperature sensor - Circulating pump (CHWP = Chilled water, CDWP = NTS - Not to scale Condenser water, LTHWP = Low temperature hot water) OBD - Opposed blade damper - Cross talk attenuator Ta - Averaging temperature sensor - Flexible coupling (FC) OE - Duct open end C - Wall mounted AC unit controller OD - Outside diameter (or dimension) - Round lobster back bend - Isolating & Regulating valve (IR) - Curtain type fusible link fire damper CC - Central controller SB - Seismic brace - Double regulating valve (DRV) SU - Duct sets up - Control Panel - Pressure Sensor CP P SD - Duct sets down - Mitre bend with turning vanes - Blade type fusible link fire damper - Isolating butterfly valve (IV) - Reed Switch - Solar Sensor TOS - Trim on site RS SS - Isolating ball valve (IV) UC - Undercut door by builder - Blade type motorised fire damper - After Hours Switch - Occupancy Sensor M AH OS - Motorised 2 port valve (MCV) VCD - Volume control damper M - Double bend PB - Push Button GD - Gas Detector - Motorised 3 port bypass valve (MCV) Taper Abbreviations BL - Bottom Level - Heater bank RH - Humidity Sensor S - Solenoid valve (SV) BW - Both Ways - Trouser piece C0 - Carbon Monoxide Sensor - Non-return / Check valve (NRV) ET - Equal Taper - Flexible canvas connection SL - Side Level CO₂ - Carbon Dioxide Sensor - Double check / Non-return valve (DCV) TL - Top Level.