Is this common practice?

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My extract fan in my ensuite is in a wall which has a void made for my soil pipe. Opposite the extract fan (about 300mm away) on the external wall is a clay air grille BUT it isn't connected to the fan. This is from new the house is about 20 years old.)
The owner before me has put a grille over the shower and run a flexible in the loft to another fan then the flexible is dropped down the soil pipe void hanging next to the external air grille. Is this common? cant help thing its putting moisture into my soil pipe void
 
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It is not good practice and the fan should be ducted completely to the outside.

The soil stack cavity may need to be vented separately for other reasons especially is an Air Admission Valve has been installed to the soil pipe to obviate the need for a stack to roof level.
 

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