Pre-Filter

This is the carbon pre-filter that works with a lot of Honeywell air purifiers. It comes with a template for you to cut and fit your particular model. So make sure you have a scissor ready to cut them to size. Or use your existing pre-filter as a template to cut. The carbon filter removes smoke smell as well as VOCs while the HEPA filter removes mainly dust.

I have used these for years, would not be without them.

Have bought innumerable times. Very good product’

Like the performance and would have given it a 5 star if I did not have to cut the pre-filter to size to fit my particular large Honeywell air purifier. My Honeywell is the largest model they make, and I realize smaller models may need the be cut, but the large one should fit without having to cut. Cutting creates some debris when cutting which is a bit of a nuisance.

I bought this because I had been buying the HRF-AP1 from the largest brick & mortar retailer in the world (starts with a W). They stopped carrying it, seemingly overnight, and instead only offered only HEPA and carbon prefilters packaged together. You replace the carbon pre-filter 5x to 10x more often than HEPA cartridge so that move made no sense. You would be hard pressed to find a genuine Honeywell HRF-AP1 pre-filter in stock anywhere locally or even on the web. I initially bought a 2 pack of 16"x48" prefilters described as "odor reducing", "carbon pad", & "charcoal filter". This was a major aftermarket domestic filter company that sells on Amazon. I knew something was off when I opened their filters and there was an ODOR. What? Wait a minute, how am I detecting something like a VOC coming from an activated carbon filter? I compared the filtering ability of some HRF-AP1 remnants to the aftermarket junk I bought and wasn't all that shocked to fink that the honeywell remnant removed just about any source of odor I put in front of it while the aftermarket had no affect on any of the same odor sources or VOC sources. Yeah, I eventually became disgusted by the smells accumulating in my living space and aggressively searched for a viable alternative. I noticed that Amazon manages to keep the HRF-APP1 A+ version in stock for just a few bucks more than what I was used to paying. It threw me off that they used a generic pic of the carbon filter wrapped around a drum HEPA cartridge instead of a pic of the retail box which one might expect to see. The only difference I can see is that the A+ version has white flecks in the filter which are identified by Honeywell as "zeolite" which you can read all about on wikipedia. It has some ups and downs. For instance now I don't feel comfortable wearing a square of HRF-APP1 inside a mask since zeolite is a respiratory irritant. You can cut this Honeywell activated carbon filter sheet to fit just about anything that you need a filter or pre-filter. For example, I use it for odor reduction as a prefilter on two Holmes HEPA units. I can make 4 prefilters with a little left over for other things such as deodorizing the fridge, sock drawers, bath towel storage area etc. etc. I suspect that Honeywell doesn't like that their product gets used for so many other applications, especially HEPA units made by other brand names/manufacturers since a major retailer started to only carry the package deal of HEPA and carbon pre-filters together. If so, what would be the reasoning? They are making MORE money than if they only sold the carbon filters to people needing them for Honeywell products. This is one of the most value packed and versatile products out there. I hope this review helps others in making a wise purchase.

Perfect

The replacement Hepa seems to fit and work fine . My contact dermatitis to dimethyl fumarate cleared up a great deal after first night's sleep . Slept like a baby . . . for a change . The new Honeywell purifier also working fine . I had them both going full throttle . I looked at the old complaints , and did not notice any problem . And I don't want to go looking for problem . It is a lot of trouble to take things back and then wait again for a replacement . Also put a MERV-13 Filtersfast in my apartment intake . Been fighting this allergy for over a year off and on , mainly on for the first year . Destroyed those 2 leather-recovered-with-fabric La-Z-Boy recliners from China , but the dimethyl fumarate got into the carpet and the air . Fingers crossed !

I know, overpriced for what it is, you can get regular air conditioner filter and cut it to fit, blah blah yes you're right. I will still keep buying the OEM filter. Works great, fits great, super effective.The smoke season was bad here in western WA. This filter made it very easy. Just keep changing it on the air filter and everything will be ok. Zero smoke odor in the house.