Wool pile: finned or non-finned?

A landlord from WA says:
September 25, 2012
Should I get a finned weatherstrip or a non-finned weatherstrip? We have commercial storefronts with older glass/metal doors, most of the doors are missing weatherstrip or it's totally worn down. They don't seem to have used finned before but I'd like know why or when you would use finned. Thanks!
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Tom from SWISCO responded:
September 26, 2012
Thanks for posting! The fin exists to help block wind infiltration. However, the fin also tends to make it a little harder to open the window. If your original windows did not use the fin before, then it'd be best to go with non-finned wool pile.
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