DZD ATEX GAS and HYDROGEN – explosion-proof axial roof fans for explosive gas and hydrogen atmospheres, ≤6510 m³/h

DZD ATEX GAS and HYDROGEN – explosion-proof axial roof fans

DZD Ex e axial roof fans with horizontal air discharge are designed for potentially explosive gas and hydrogen atmospheres classified as Zones 1 and 2. The fans comply with ATEX Directive 2014/34/EU and have ATEX and IECEx approvals.

The fans are suitable for gases and vapours in groups IIA and IIB, including hydrogen (IIB+H₂). The maximum airflow capacity of the series is 6510 m³/h.

Construction

• axial impeller made of electrically conductive plastic
• motor and impeller assembly balanced to quality grade G 6.3, category BV-3 according to ISO 14694
• mounting base, inlet nozzle and rain cover made of galvanised sheet steel
• horizontal air discharge

Motor

• three-phase asynchronous reversible AC motor
• maintenance-free ball bearings
• S1 continuous duty
• approximately 35% reduction in airflow when the airflow direction is reversed
• speed control using TR transformers, except for DZD 35/2 B Ex e
• PTC thermistors for motor temperature monitoring
• MAICO MVS 6 or TMS thermistor protection devices recommended
• IP64 protection rating
• insulation class F
• increased safety “e” and constructional safety “c” ignition protection types

Explosion protection

• ATEX Directive 2014/34/EU
• equipment category II 2G for Zones 1 and 2
• II 2G Ex eb IIB+H₂ T3/T4 Gb X
• II 2G Ex h IIB+H₂ T3/T4 Gb X
• type examination document TÜV-A 19 ATEX0104 X
• IECEx certificate IECEx EPS 19.0020X

Applicable standards

• IEC 60079-0
• IEC 60079-31
• IEC 60079-7
• ISO 80079-36
• ISO 80079-37
• EN ISO 80079-36
• EN ISO 80079-37

Operating temperature

• −20 °C to +40 °C – DZD 25/2, 30/6, 35/6 and 40 series models
• −20 °C to +60 °C – DZD 25/4, 30/4, 30/2, 35/4, 35/2, 50/4 and 60/6 models

The operating temperature range for DZD 50/6 is not specified separately in the catalogue description.

Additional versions

• 60 Hz versions available on request

Available accessories

• SD – silencers
• ELA Ex – flexible connections
• SG – safety grilles
• SO – mounting bases for flat roofs
• SZ – intermediate connecting bases
• DDEx – differential pressure switches
• DSS – five-speed transformer controllers
• MVS6 – PTC thermistor monitoring devices
• TMS – thermistor protection relays
• TR – transformers
• SOWT – mounting bases for corrugated and trapezoidal roofs
• SDS – mounting bases for pitched roofs

DZD ATEX GAS and HYDROGEN – technical catalogue (PDF)

The accessories are not included in the fan type examination certificate. Contact the manufacturer's technical and sales department for alternative construction solutions.

DZD ATEX GAS and HYDROGEN – dimensions

All dimensions are in millimetres (mm), weights in kilograms (kg). Weights are approximate.

DZD ATEX GAS and HYDROGEN – technical information

The DZD Ex e series is designed for potentially explosive atmospheres containing gases and vapours of groups IIA and IIB, including hydrogen. The series comprises 13 models with maximum airflow capacity up to 6510 m³/h.

Fan technical specifications

T – three-phase motor; Pm – motor power; In – rated current; Q max – maximum airflow; LwA5 – sound power level with free inlet. The specific fan supply voltage is not stated in the catalogue performance tables.

Explosion protection marking

• II 2G Ex eb IIB+H₂ T3/T4 Gb X
• II 2G Ex h IIB+H₂ T3/T4 Gb X
• ATEX Directive 2014/34/EU
• type examination document TÜV-A 19 ATEX0104 X
• IECEx certificate IECEx EPS 19.0020X

Applicable standards

• IEC 60079-0
• IEC 60079-31
• IEC 60079-7
• ISO 80079-36
• ISO 80079-37
• EN ISO 80079-36
• EN ISO 80079-37

Operating conditions

• potentially explosive Zones 1 and 2
• gas and vapour groups IIA and IIB, including hydrogen
• −20 °C to +40 °C – DZD 25/2, 30/6, 35/6 and 40 series models
• −20 °C to +60 °C – DZD 25/4, 30/4, 30/2, 35/4, 35/2, 50/4 and 60/6 models
• IP64 protection rating
• insulation class F
• S1 continuous duty

The operating temperature range for DZD 50/6 is not specified separately in the catalogue description.

DZD ATEX GAS and HYDROGEN – installation instructions

Installation location and conditions

DZD Ex e explosion-proof axial roof fans are intended for installation on building roofs, with horizontal air discharge. They are suitable for potentially explosive gas and hydrogen atmospheres classified as Zones 1 and 2, in accordance with their ATEX and IECEx markings.

The mounting base must be selected according to the roof construction and the dimensions of the specific fan. The manufacturer offers SO bases for flat roofs, SOWT bases for corrugated and trapezoidal roofs and SDS bases for pitched roofs. SD silencers, SZ intermediate bases, ELA Ex flexible connections and SG safety grilles may be used where required.

Electrical connection and motor protection

The fans use three-phase asynchronous motors with integrated PTC thermistors for temperature monitoring. The manufacturer recommends MVS 6 or TMS thermistor protection devices for motor thermal protection. These devices must be installed outside potentially explosive areas.

Fan speed can be controlled using TR transformers, except for the DZD 35/2 B Ex e model. The fans can operate in reverse mode, but airflow is reduced by approximately 35% when the direction is reversed.

Safety and operation

• installation and electrical connection must be performed by qualified personnel in accordance with requirements for potentially explosive atmospheres
• verify the ATEX marking, temperature class and permissible ambient temperature of the specific model before installation
• securely fasten the fan to a suitable roof mounting base
• ensure electrical connection and motor protection comply with the manufacturer's documentation
• check free rotation of the impeller, airflow direction and operation of protective devices before commissioning
• perform maintenance only after safely disconnecting the power supply and preventing unexpected start-up

Manufacturer's technical documentation

Detailed information on fan construction, operating conditions, dimensions, electrical protection and mounting accessories is provided in the manufacturer's technical catalogue.

DZD ATEX GAS and HYDROGEN – technical catalogue and installation information (PDF)