Cod. 985719 – 00 / July 2004
8
Do not hook the units in the following points:
• inlet cone
• wheel cone
• blade
• single shaft end
• motor (for complete units)
• bearing or bearing support bar/bracket
• cut-off
2.4. STORAGE
All Nicotra fans are designed to be stored for a maximum period of six months under the following conditions:
• storage temperature range: -25°C ÷ +65°C
• relative humidity: < 60%
• protect the fans against direct rain or snow
• store the fans in premises, which are adequately ventilated and heated so that no condensation will occur on the
units
• rotate the wheel at least once a week, to permit the redistribution of the grease inside the bearing and prevent
corrosion
• protect the units from external loads or vibrations
• avoid the exposure to direct sunshine and UV rays
• protect the fans from corrosive agents
3. FUNCTION AND DESIGN OF THE FAN
3.1. OPERATING CONDITIONS
The operating data for fans in standard version are listed in the specific catalogues.
In general fans are designed for use with “clean air”.
For particular operating conditions such as temperature different from the standard range, airflow with corrosive agents,
high humidity, special applications or use outside the standard limits, please contact our Technical Department.
The fans in ATEX version are designed to work under the specific conditions of the “group”, “category” and “temperature
class” stated in the rating plate.
The standard limits for ATEX fans are listed in the tables enclosed in this manual. The specific limits of a special fan
could be different from those of the standard version and are listed in its rating plate.
3.2. OPERATING LIMITS
3.2.1. Max installed power
In the tables enclosed in each catalogue are listed the power limits and the minimum diameter of the smallest
transmission pulley according to the applied power.
The belt tension must never exceed the values calculated in the selection program “Ventil”. The values for the first
tensioning are indicated in the chapter “Belt tension”.
3.2.2. Maximum speed
Maximum permissible speed is listed in the tables enclosed in the catalogues.
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