Replacing the blower filter on a Selmi Chocolate Conveyor Belt

[sesho8]

Hello everyone! I was looking for assistance or resources on replacing the air filter on my Selmi Chocolate Conveyor Belt the RS200 (well, not mine, my works' machine, but I am its unlucky caretaker)

 

My Kitchen Manager was asking when this part had been cleaned or replaced and in the two years I have been here, it has not been replaced. 

 

I was curious on if anyone know how often it must be replaced or how to replace the filter? I've found where to purchase a replacement but I couldn't find any information in the owners manual on replacement.

 

Any information would be extremely appreciated! Picture of the current air filter included so you can see how bad it is.

[AlaMoi]

the maintenance manual is here

https://tomric.com/wp-content/uploads/2022/01/RS200-ENG-Ed-20190201.pdf

 

but it does not specify how often / conditions under which the filter should be changed.

which . . . obviously depends on hours of use, general cleanliness of 'environment' / etc.

 

from the pix, if that's two years(+) - I start with replace&check every year....