Fresh air intake on 4K/CGT

["Allan Jones" <ampj@mediaone.net>]

I was just browsing Huw's pics on his site and I noticed the airscreen was
barely even a macro-filter.  I respect every single thing done by Huw...so I
am now wondering if I went too far by modifying a Bionaire air
filter(designed for air cleaning machines) to fit that same opening?  Has
anyone else done this?  I used to get fragments of leaves and pollen blown
directly into my face! ...and would have to dust my interior very often, now
I have none of that. I did it over two years ago and am still very happy
with the results, but there may be a downside I don't know about...Huw?
Anyone?

TIA