Depends.
Do you have a cat ? A dog ? Are you hairy (i am and a lose more hair than my neighbour's dog) ?
Do you have a carpet or a tile floor ?
Where is the inlet located , just above the ground, or 1m high ?
Are you excited at the perspective of removing hair and dust from your rad ?
It's a trade. Get a filter and make sure your rad stays clean, or dont and take the risk of clogging it with lint.
BTW, a hair / dust / lint clogged rad performance will be worse than a filtered one.
It's up to you to decide.
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