Hoods are necessary to properly ventilate your kitchen, but that doesn't mean that all hoods are equal. We recently came across the full range of hoods from A-Line Appliances and we were suitably impressed.
Almost all A-Line extractors come with a newly designed filter, which has a lifetime warranty. Instead of just trapping the particles, it treats them with a plasma-based oxidation process, which neutralizes them completely, at least this is what the manufacturer claims.
We really like these range hoods, but needless to say they are expensive. They are currently available in the UK and will probably be available soon in the US. They are available at Bradshaw Appliances.