Inline carbon filters...extractor placement

Hi all, I just got an inline carbon filter...does anyone know when attaching the exractor fan to the ducting...

Is it better for the fan to push air through the filter, or pull air through from the other end?

I'm guesing pull, as that would be the same orientation as a regular 'one ended' carbon filter?

Im guessing the fan works much more efficiently one way or the other?

The bit that's also throwing be off, is the airflow direction sticker on the inline filter seems to be pointing in the opposite direction for the internal bit, compared to the regular filter?

To be honest I think their meant to push through.

However