5
6
Description
6.1
Intended use
Indended use PRF and PRF EX
• The fans are intended for installation in ventilation systems.
• The fans are exclusively intended for extract air applications.
• The fans have been developed and built to convey air with the simultaneous presence of corrosive gases/vapours.
Indended use PRF EX
• The EX fans are not ready-for-use products, but have been designed as components for ventilation equipment, ma-
chines and systems. They may only be operated when they have been installed in accordance with their use and
safety has been ensured by protective devices pursuant to DIN EN 294 (DIN EN ISO 12100-1).
• The fans are only intended for conveying air or explosion-capable atmospheres of Zone 1, Category 2G, and Zone 2,
Category 3G.
6.2
Incorrect use
Incorrect use refers mainly to using the fan in another way to that described. The following examples are incorrect
and hazardous:
Incorrect use PRF and PRF EX
• Conveying of abrasive, combustible air or air with
solid particles.
• Conveying media which attack the materials of the
fan (housing, rotor and slip rings of polypropylene).
• Operation without duct system or protection grille
• Operation with the air connections closed
Incorrect use PRF
• Conveying of explosive and combustible media
Incorrect use PRF EX
• The fan is not suitable for intake of aggressive media
or media with a dust content so high that dust
deposits on the impeller or fan housing can affect the
operation of the fan.
6.3
Technical data
Max. ambient temperature [°C]
see data sheet, available in our online catalogue.
Max. temperature of transported air [°C]
see data sheet, available in our online catalogue.
Sound pressure [dB]
see data sheet, available in our online catalogue.
Voltage, current, frequency, enclosure class, weight
see name plate of the fan
The motor data can be found on the name plate of the motor, or in the technical documents of the motor
manufacturer.
The data on the name plate of the fan apply to "standard air" according to ISO 5801.
• Housing material: UV resistant PE (PRF-EX from PP)
• Impeller material: PP
Warning
• Inspected according to ATEX Directive 2014/34/EU
• Antistatic housing
The explosion-protected fans can be used for temperature classes T1 to T4 or T6 and have been registered
for transporting potentially explosive atmospheres in Zone 1 and 2, category 2G and 3G, with the groups IIA,
IIB and H² (only PRF-EX Ex d).
PRF-EX Ex d has an IEC standard motor in an Ex d finish which can be controlled via a frequency inverter and
has an added-on terminal box in an Ex e finish. Motor protection is via an integrated PTC resistor with
connection to a motor protection switching device e.g. U-EK230E.
6.4
Chemical components
The standard plastic types used are polyethylene (PE) and polypropylene (PP). As a matter of principle, the rotor mate-
rial is the indicator for the selection.
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