Webasto Air Top 3500 Notice De Montage page 46

Installation Air Top 3500 / Air Top 5000
A seal (Figure 4) must be fitted between the heater and the vehicle body.
This seal must be replaced each time the heater is installed.
The support area for the heater foot must be flat. A special tool can be
purchased from the manufacturer to drill the holes and, if necessary,
smooth the support area. The seal can compensate for unevenness of
max. 1 mm.
Ensure that all moving parts can move easily!
Fig. 5: Installation
IMPORTANT
After installation, check that the casing is not in contact with any parts of
the vehicle body. A failure to do this may result in the hot air fan blocking.
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