They really do absorb odors quite well
Some of HEPA filter units put the carbon behind the HEPA filter, and some put it in front. The Vornado has the carbon as a pre-filter, saving the expensive HEPA portion for particulates. I find I change the carbon filter rather often, and so a four-pack for me is a sensible idea. I absolutely notice when the carbon has loaded with whatever muck is in the air. Then it's time to install a new one, which is not terribly difficult. I'd rather not have the HEPA filter pick up volatile components from the air, so I'd say this pre-filter works very well.
Compromised on quality
I bought 3 Vornado AQS 15 air puirifiers early in 2003 for my home and office. After almost 10 years of use, they still work great and I've been very happy with them.
So I was dismayed when I opened the latest box of presorb filters and discovered that they are of very poor quality-- half the thickness of the presorb filters I'd been getting and transparent!
We're all struggling to survive in a bad economy and I can understand cutting the cost of production, but I was pretty disappointed to see this. I'll probably use up my remaining supplies and go shop for some other brand of air purifier.
Great Filters for a Great Air Purifier
These came rather quickly and are exactly as described. Each filter is sealed in it's own bag so they stay fresh while in storage. I've heard that the AQS 15 filters are being discontinued so I'm going to bite the bullet and stock up as I go through these filters at a rate of 1 pre-sorb filter every 2 months.
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