INDUSTRIAL VENTILATION · ATEX GUIDE

Does your installation involve an explosive atmosphere?

Flammable gases, vapours or dust: start with the zoning defined for your site. It guides the equipment and marking to be considered.

Understand the essentials

Visual guide

From risk to the right marking

Follow the path: atmosphere, site zone, equipment category, then marking.

AtmosphereGas · vapours · dust

Site zoneDefined by site zoning

CategoryEquipment property

MarkingCheck it in full

Where and when can it occur?

Choose a medium to see its zone scale.

Continuous / frequentor long periods

Occasionalduring normal operation

1G · 2G

Unlikelyand brief if present

1G · 2G · 3G

The zone describes the location. It comes from the installation zoning document.

Which category should you check?

Category = equipment · G = gas · D = dust

1G / 1DHighest level of protection

0 · 20

2G / 2DEnhanced level

1 · 21

3G / 3DFor Zones 2 / 22

2 · 22

2GD · 3GDCombined marking: verify both gas and dust suitability

Important Product sheets below cover Categories 2 and 3. Zones 0 / 20 require Category 1.

Decode a marking

Select a token to understand its role.

II: equipment intended for surface industries.

LEARNING EXAMPLE · INCOMPLETE FRAGMENT

Motor guide

Which motor marking for each zone?

Start with the zone listed in your site documentation, then check the complete motor nameplate and the conditions in its instructions.

Gas · Zone 0Ga

Very high protection is required. A marking limited to Ex db, Ex eb or Ex ec is not sufficient for this zone.

Gas · Zone 1Gb

Ex db: flameproof enclosure. Ex eb: increased safety. These protection types can correspond to EPL Gb when the certificate covers the motor and its use.

Gas · Zone 2Gc

Ex ec: increased safety for EPL Gc. An EPL Gb motor may also be assessed for Zone 2 when the other parameters match.

Ex db IIC T4 Gb — learning example

Select each element: a real nameplate may include other codes and conditions.

Ex: equipment designed according to one or more explosion protection types.

II 2G · Ex db / Ex eb · GbExamples of gas marking to assess for Zone 1. Selection also depends on the gas subgroup and temperature.

II 3G · Ex ec · GcExample of gas marking to assess for Zone 2. EPL Gb may also be assessed when the complete marking is suitable.

Zone 21 → Db · Ex tb | Zone 22 → Dc · Ex tcFor dust, also check group IIIA / IIIB / IIIC, the maximum surface temperature shown in °C and the IP rating. Zone 20 requires EPL Da.

IIA · IIB · IICGas subgroups, to compare with the actual substance. IIC is the most demanding.

T1 ≤450 °C · T2 ≤300 °C · T3 ≤200 °C · T4 ≤135 °C · T5 ≤100 °C · T6 ≤85 °CMaximum surface temperature for gas classes. The higher the T number, the lower the maximum surface temperature.

IIIA · IIIB · IIIC · T°C · IPFor dust: check the group, surface temperature in °C and ingress protection rating together.

Ta / Tamb · X · UTa/Tamb: permitted ambient range. X: special certificate conditions. U: Ex component that must be integrated according to its certificate.

The markings after the protection code matter too. Check gas or dust group, T / °C, Ta or Tamb (ambient), IP, voltage, frequency, speed and inverter use. Certificate suffix X signals specific conditions; U identifies a component rather than complete equipment. Case matters: db is a gas protection type, while Db is a dust EPL. A motor alone does not certify the assembled fan.

Ex eb, Ex db or Ex ec alone is never enough to select a motor: the complete nameplate, certificate, instructions, gas or dust, ambient temperature and fan assembly must match the application. Have the selection confirmed before ordering.

To assess your application

Documented zoneGas / dust identifiedAirflow · pressure · temperatureMarking and product sheet

These visuals provide general guidance: site zoning comes from the risk assessment, and each item’s complete marking must be checked for the application. Prevention guidance (INRS) ↗

Selection assistant

From site zone to fan + motor marking

Answer five steps. The result separates the target marking for the fan and its motor.

01Atmosphere
02Zone
03Substance
04Motor
05Result

1. Which atmosphere is listed in the zoning document?

Use the zoning document prepared for the installation.

Step 1 of 5

Zoning comes from the installation risk assessment. In mixed atmospheres, gas and dust requirements remain separate. A calculated profile does not replace checking the complete assembly certificate.

Understand ATEX zoning and markings ↗

Product sheets

Fans listed in the ATEX catalogue

Open a product sheet to review the characteristics and documents for that reference.

HC

Select a product sheet to view its reference details.

Ventiladores axiales

HCCM / HCLM

Ventilador axial mural con placa de montaje.

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Ventiladores axiales

HC

Ventilador axial para instalación en conducto, carcasa corta HCC o larga HCL con bridas de conexión, acoplamiento directo.

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Ventiladores axiales

HC · con embocadura

carcasa abocinada corta HCCP o larga HCLP con bridas de conexión, acoplamiento directo.

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Extracción de humo y gases

HC 400°C/2H

extracción de humos · Ventilación de edificios terciarios carcasa corta HCC o larga HCL con bridas de conexión, acoplamiento directo : F400 120 Diámetro del rodete / hélice : 400– 1600mm Caudal :…

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V-SOD

Select a product sheet to view its reference details.

Ventiladores centrífugos

V SOD

Ventilador centrífugo de simple aspiración, rodete de acción, palas estampadas TUE, accionamiento directo, voluta soldada por puntos, en acero galvanizado, acero inoxidable, aluminio.

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VP-SOD

Select a product sheet to view its reference details.

Ventiladores centrífugos

VP SOD

Ventilador centrífugo de simple aspiración, equipado con rodete TURA de acción de alto rendimiento con palas montadas, accionamiento directo, voluta soldada por puntos, en acero galvanizado, acero inoxidable, aluminio.

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Roof fans

Select a product sheet to view its reference details.

Extractor centrífugo de cubierta Tipo JET

Ventiladores de tejado

JET

Atmósferas explosivas · Ventilación industrial · Ventilación de edificios terciarios Extractor centrífugo de cubierta, en polipropileno, descarga vertical Diámetro del rodete / hélice : 200– 300mm…

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