Kongsberg Simrad ST90, Reference Manual

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Context
All Heatex’ heat exchangers [...] have been designed in such a way that dirt is
prevented from coming into contact with the heat transfer surfaces. Most of the dirt
that is contained in the air will just pass through the heat exchanger since it has been
designed in a correct way.
Substances that have the highest risk of fouling the exchanger are sticky substances that
condense on the surfaces and also fibres from, for instance, dry tumblers.
Experience has shown that the build up of dirt in a heat exchanger is often limited to
the first 50 mm in the exchanger, which simplifies cleaning. For normal ventilation
applications, it is mostly satisfactory to clean the inlet and outlet with a brush or to
clean them by using hot water and, if needed, some mild detergent.
For more dirty applications, compressed air or high pressure water flushing can be used
provided maximum flushing pressure with a flat flushing nozzle is kept below 100 bar.
Please observe that high pressure flushing must not be made directly against the plates!
Although the plates in the aluminium heat exchangers are made of material that is up to
0.25 mm thick, care must be taken when mechanical means to remove dirt is used so
that the plates does not deform or brake.
Technical information sheet from the manufacturer Heatex
Maintenance procedures