Also referred to as "HOLMES type C" prefilters...
These are getting tough to find locally -- it used to be I could walk into Sears and walk out with a box, but now they're only interested in selling me the more expensive "type B" HEPA filters that these carbon filters fit over.
There are four of these per box, yet only three are needed per change in our Holmes HAP 650 purifier. The purifier is in use in a converted basement bedroom in the house -- it has a moisture control problem, we have the diaper changing table in there, and we own dogs. The evidence is clear every time we change these filters. Not only is there a lot of dust, dander, pet hair and whatever collected in these, but the smell of the room becomes noticeably improved every filter change.
The main function of these filters is to keep the more expensive HEPA filter beneath Holmes HAPF600D from getting clogged. They can be rinsed out under the faucet, by the way, if you don't...
smaller than they used to be?
I've owned a few Holmes air purifiers over the last ten years and their effectiveness is immediately evidenced by all the dust, particles and cat hair that get trapped in these carbon prefilters. However, this time around I noticed something that I'm almost positive was not the case before...the carbon prefilters do NOT entirely cover the HEPA filter. This will allow particles to enter the HEPA filter on the edges and surely decrease the useful life of the (more expensive) HEPA filters. These are GENUINE Holmes prefilters, they should NOT leave a gap around the edge of the HEPA filter. The gap isn't HUGE, but there is a gap. This is a big disappointment to me.
Please see my photo under "customer photos".
Replacement filters
These are exactly the same as the ones that came with the unit. Fits well, good quality.
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