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HVAC · Ireland

HVAC Symbols — Ireland (TGD Part F / I.S. EN 13141)

Irish mechanical services drawings are read against Technical Guidance Document F of the Building Regulations for ventilation, with the I.S. EN 13141 series covering how the components themselves are tested. The symbols are the international ones — a duct is a duct in Dublin as much as in Doncaster. What differs is the commissioning trail: TGD F 2019 introduced mandatory testing of mechanical ventilation in dwellings, so an Irish drawing is usually accompanied by measured airflow results rather than design figures alone.

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TGD Part F (Ventilation) / I.S. EN 13141 series12 symbols
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DuctworkControlsTerminalsEquipment

Ductwork

Supply Air Duct

Rectangular supply air ductwork

CIBSE Guide B

Extract Air Duct

Rectangular extract air ductwork

CIBSE Guide B

Circular Duct

Circular / spiral ductwork section

CIBSE Guide B

Controls

Volume Control Damper

Manual or motorised air volume control damper

CIBSE Guide B

Fire Damper

Fire-rated damper in ductwork penetrating fire compartment wall

BS EN 15650 / CIBSE

Room Thermostat

Room temperature sensor / thermostat

CIBSE Guide H

Thermostatic Radiator Valve

TRV for individual radiator temperature control

CIBSE / BS EN 215

Terminals

Supply Air Terminal

Wall or ceiling supply terminal. Its measured flow rate is recorded at commissioning under TGD Part F rather than taken from the design

CIBSE Guide B

Extract Air Terminal

Wet-room extract terminal. TGD Part F sets minimum extract rates for kitchens, bathrooms and utility rooms, and those rates are measured on site

CIBSE Guide B

Equipment

Air Handling Unit (AHU)

Central air handling unit with filter, coil, and fan sections

CIBSE Guide B

Fan (Axial)

Axial or centrifugal fan

CIBSE Guide B

Heat Recovery Unit (MVHR)

Plate or counter-flow heat exchanger. Common in Irish dwellings built to TGD Part L, where continuous mechanical ventilation with heat recovery is a usual route to compliance

CIBSE Guide B

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Frequently asked questions about hvac symbols

Does Ireland use the same ventilation symbols as the UK?
Yes. Ducts, dampers, grilles, fans, air handling units and heat recovery units are drawn identically on both sides of the Irish Sea, because both follow the same European component standards. What changes is the document named in the title block: TGD Part F rather than the Building Regulations Approved Document F.
What does TGD Part F require beyond the drawing?
Mechanical ventilation in dwellings has to be tested once installed, not just designed. The Department’s guidance on installation and commissioning of ventilation systems sets out how the measured airflows are recorded, so the drawing is only the first half of the evidence.
Which standard covers the components themselves?
The I.S. EN 13141 series covers performance testing of ventilation components for residential buildings — different parts deal with terminals, ducts, and units. It tells you how a component was rated; TGD Part F tells you what rate the installation has to achieve.
Do heat pumps appear on these drawings?
Often, yes. Where a heat pump serves the heating system it is usually shown on the mechanical services drawing alongside the ventilation, and its commissioning is recorded separately. CertBox has an Irish heat pump commissioning certificate for that record.

Related symbol guides

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HVAC & Ventilation Symbols — UK (CIBSE)

12 symbols · CIBSE Guide B / BS EN 15232 / BS EN 16798

🇦🇺

HVAC Symbols — Australia (AS 1668 / AS 3666)

12 symbols · AS 1668.2 / AS 1668.1 / AS/NZS 3666.1

🇮🇪

Plumbing & Heating Symbols — Ireland (IS EN 806)

14 symbols · IS EN 806 / TGD G / TGD L

Related certificates on CertBox

Ie Heat Pump Commissioning CertificateIe Heating System Commissioning Certificate

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Symbols based on TGD Part F (Ventilation) / I.S. EN 13141 series. This is a reference guide only — always consult the full standard for official symbol definitions.