Operating manual
Small centrifugal fans
HF R 75 | HF R 110-18 D 7
www.hlu.eu 08.2022
Installation inside the explosion-hazarded area:
Installation inside the explosion-hazarded area is not permissible,
unless the fan is provided explicitly for this purpose (see type label
Chapter 4.2).
If the fan for an installation with an open inlet or outlet or is provided
for an inlet-side duct connection as part of a larger installation, the
operator is obligated to prevent the penetration of foreign bodies that
can cause ignition according to DIN EN 14 986, point 4.22.
Repair and maintenance works of explosion-proof fans may only be
performed by qualied persons in the explosion protection by
using original spare parts.
If the fan has an open inlet and / or outlet (Type A, B, C according to
ISO 13349), the fan must have the same category inside and outside.
Types of connection
2.2 Correct use for the intended application and eld of application
The fans are suitable for exhausting aggressive, dust-free, low-aerosol gases and clean air.
Explosive atmosphere can be exhausted only using fans designed specially for this application.
The permissible gas temperatures for the most frequently used plastics materials are generally
with PE, PE-FR (PEs) -20 °C to 60 °C,
with PP, PP-FR (PPs): 0 °C to 70 °C,
These temperatures must not be exceeded.
Depending on gas composition and impeller speed, these temperature ranges must be check
and restricted, if necessary. With particularly aggressive media, the reductions must be checked
and determined individually in each case. The max. ambient temperature is 40 °C.
Sucient cooling can be ensured regardless of the volume ow, in accordance with the
above-mentioned conditions.
The fan was developed, designed and built exclusively for industrial and commercial use. Using
the fan for domestic purposes is excluded.
Residual risks
Although the fans have been constructed according to the newest
technology as well as to the security rules and they are monitored by
quality assurance (QA) system, there remains a residual risk due to
the possible rupture of the impeller. This happens especially, when
the conditions of use have not been complied. Therefore it is neces-
sary to pay attention on technically perfect conditions and on the right
case of application. The environment of the fans has to be secured
in such a way, that in case of a damage, neither persons nor objects
get harmed.
