Unfortunately this time for some unknown reason SEAT didn't include any cut out hole to make it easier, in previous generations this wasn't a problem. I was looking for options to add it but that would mean completely redesigning the parts as the simple hole cut out would make the structure itself not strong enough and potentially collapse.
 
A simple job in some cars, and a PITA in others. I specifically requested a cabin filter change at my last service and they said they had done it. Fan did produce a bit more draught so I had to take it on trust. Formentor 310 looks same as yours, a lot of hassle and potential io mess things up.
 
Just finished my one RHD replacement. It's a bit challenging but durable. No need to remove (lower) the glovebox shelf. There are 4x T20 screws inside the glovebox, a plastic clip and 1x T20 screw on the left side under the side cover and one sneaky T20 screw hidden on the bottom right side of the end. You have to also drop the bottom cover 3x T20 screw under the glovebox for better access. Don't, unplug the Airbag switch if you dont have the diagnostic to reset the fault afterwards. And dont forget to unplud the glovebox light the cable is rather short. Picture attached. My filter was pretty stuffed with all sort of sh.t. :rolleyes:
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Thanks - this was invaluable! Whoever designed this needs to have a word with themselves 🤣