Filtes: What is the difference between an HMC filter and one that is not HMC?
151670
Hoya Standard filters have one layer of anti-reflectant coating to each surface of the glass to suppress reflection and increase light transmission. HMC (Hoya Multi-Coated) have 3 layers of anti-reflectant coatings on each surface to reduce average reflection down to 3.0% or less. Hoya S-HMC (Super HMC) also have 6 layers of anti-reflectant coatings. Finally, the Super HMC PRO 1 is made of thinner glass (only 1mm thick), also with 6 layers of anti-reflectant coatings bonded to each surface of the glass.
629352
Phil - HCC20-28 is the model number of the filter chassis and HCF20-16 the model number of the filter. Hope this helps. Alan
830803
The filter basket (the plastic basket that holds either a disposable paper filter or a permanent filter) is included, as is a filter disk. Paper filters are easy to find, and I think I recall that 1 was included. The permanent filters work well, and may be worth the few extra $.
1394989
The filters (2) are proprietary and only available from Trend. They are high quality foam type filters but I don't think they are hepa rated.I use the Airshield for woodturning and find it to be very effective for air filtration and face protection.
16136
I believe the difference is the level of filtration. I use the ez4 b/c It filters out more and smaller contaminant particles
2172646
they are all the same, there is no permament HEPA FILTER, its just the brand name for marketing reasons, N HD S version are the same, and use the same filter, they are just version for diferent vendor, like home depot or amazon, so not even the N version is permament , the illusion of a permanent filter is good for sales, but amazon decided to changed that brand name for "long lasting vacunable filter"
365173
I think the main differences are a better filter and digital controls. But you can do a comparison on their website to make sure.
1719737
The filter requirements is a bit confusing. Three HEPA filters and three carbon filters are required for the larger room model # HAP756-U which I recently purchased and currently using. (Two of both the HEPA and carbon filters are required for the smaller room unit HAP726) Three true HEPA filters were included with the my unit and already installed (there are no discernible marking on the installed filters I can detect indicating a filter model number). However, there were no carbon filters installed or included with my purchased unit but I did purchase a pack of 4 which I installed when I set up my unit. I purchased a package of 2 Holmes make HEPA replacement filters (HAPF600D - B Filters) at the same time. Had I researched this better, I would have purchased the same box of 2 filters, plus 1 lone filter (same model #) since the unit requires that all three filter be changed when the red light indicates the filters be replaced. I am not aware of any distinction between an HAPF600 and an HAPF600D filter and I couldn't find this out on the Holmes website, either. Perhaps (but not sure) the "D" version removes either different allergens or more allergens from the air. As far as the "B" designation, I believe this identifies these as HEPA filters versus the "C" designation applied to the carbon filters.
448247
Unfortunately one 1 filter. It makes a huge difference as it is pleated and much wider than the other ones.
674174
This uses the standard regular basket shaped filters. Sorry if that doesn't help, I'm not sure if it's a numbered thing like other filters.
1229415
Sorry can't really answer this accurately because they sent me the wrong filter.
765366
I recommend you try the filters from HEPAairdirect. In my opinion they are better quality filters with aluminum not styrofoam housings, made in the US and less expensive than IQair.
741983
As far as I know, all the filters are the same except for the water bottle filter. For some reason the part #'s are differeent and make it seem as though they're different filters.
1133170
Don't know, I got rid of both filters, they sucked, both leaked from day one. Piss poor molding on the too half. Don't buy it
273374
I can confirm your findings, I have two boxes (6 each) of Filtrete Premium Healthy Living Filter that do not contain mpr data. I am checking with 3M and will get back to you.
2011472
Buyer beware as there are a TWO different filters being sold under the SAME basic HC-504 nomenclature. The original/good version is 1.25" thick, whereas many of the more recent offerings are only 0.75" thick, therefore with MUCH less moisture-delivering efficiency/life, yet at the same price. Worse yet, often the images shown in Amazon are dimensionally proportional to the original/good ones but what they really ship is the inferior version - I know because I just returned six filters to Amazon but got stuck with shipping charges and wasted time. Someone else suggested another source (filters-now dot com) and I'm sending them an inquiry based on the above. (PS- some of the filter offerings tout a blue "dust catching" wrap that IMHO is pure marketing hype.)
1497555
I have not changed the filter in my units yet. I have cleaned them, meaning I have knocked the dust off them. But I have not replaced them. There is a small somewhat fragile one in there that you want to be careful with as I guess there is no replacement. The other is larger, maybe paper although I don't remember for sure. This is the one I have knocked the dust off.