1-Package without fan:
In buildings where the chimney is only vertical with a diameter of 15 cm and a maximum height of 8 meters, it is possible to use a package without a fan, otherwise it is necessary. Use a fan package.

2-Fan package:
In buildings that have high heights or some of the chimney is installed horizontally, the fan package is definitely used.
Fan package with chimney (coaxial) gives the user the possibility that instead of using the air inside the building, the air entering the package is directed inside from the inner wall of the chimney and after the combustion of the smoke from it through the outer wall Chimney outside
In this condition, the heated air of the environment is not used in any way, therefore, in the package with fan with coaxial chimney, the energy consumption will be less than the package without fan.

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