Advice on pollen / cabin filter. 1.5 Almera n16

Hey guys.
Just about to replace pollen filter with a new wix one,and the direction sheet in the box with it shows the arrows facing down towards the floor when the new filter is in the housing. I'm confused because the old filter arrows were pointing upwards, and the Haynes manual, and other places online say the arrows are to be pointing upwards. So does anyone out there have any suggestions as to what to do. By arrows I mean the air flow direction arrows. How will I know if its the wrong way around?
Thanks in advance for any advice,i'm off to the dentist now so i'll check back later
 
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