I have one of those vacuum attachments which lets you vacuum under the fridge, and I use that frequently -- twice a month at least. I think the filter idea is good IF you regularly clean that. The hair will build up on it rather fast, as I have discovered! I have forced hot air for a heat system, and put filter in the return registers as well. Darn nuisance as I also have to clean that every 2 weeks! But I know it is better than having all that cat hair going into the duct system.

This is what I have: http://www.mileskimball.com/MilesKim...tid=0000041565