Why do I need 5 filters when original unit was 3 ?
589964
Poor packaging? I'm not sure-- but they are good quality and less expensive. Depending on size of household, you may want to purchase 2 packages at once.
1887775
I have a Watts 5 stage filter system and this filter worked fine in mine. I don't remember the P/N of my setup because I bought the system 30 years ago.
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.
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.
1556163
I don't know the answer to that, I just use the filters that came with it.Remember to clean them after each use.
834949
It comes with all 3 filters, you will need to replace them @ the requested intervals. 2 of them are listed as needing to be changed every 6 months & 1 of them is listed @ 12 months
985192
No idea. I would try calling the manufacturer, or at least comparing the three dimensions of your existing filter.
781995
I'm not sure so I would contact the manufacturers of the system and the filters. If it does not I am sure they would have an experts answer to your problem.
2246582
It seems to me that it use to come with two filters in the past: https://youtu.be/-W7eGbyRRgoThese videos might interested you as well: -- https://youtu.be/cj5DzwRY-Ds-- https://youtu.be/7yHsBjIYuAQ
1339504
When I bought mine, price included 3. Must have at least two to use. They supply a plug to plug one hole, should a filter become unserviceable. Filters are quite slow because they do a good job. Fewer filters means longer wait time.
1265258
Mine came with a few filters. I don't recall how many, but there were some included.
1933300
I have not been able to figure out where the filters go on my unit (don't remember model #.) I haven't used them. Sorry no help on your question.
1950245
3. :-). It's got something to do with the density of the filter. The higher the number the more tiny the particles it can trap. However, this also cuts down on airflow and will cause your system to need to run harder or longer, which will raise your energy bills. My research into the matter suggested 11 or higher is for commercial/industrial needs. But 8 was deemed efficient enough / recommended for residential purposes. I hope that helps. Dontcha hate it when you ask a question and someone responds "Google it"?
447193
This filter unit accepts most common filters and all filters have various filtering properties. the unit has a bypass valve built in so extra valves are not needed to change filter units. Good product design.
221345
The unit comes with one filter however I would suggest that you buy a pack of two replacements at the same as you place your order.
163244
There are two models, a large and a small. I have the large and it uses a number 4 filter.
1781448
Nope, Ive now had mine for quite a while and everything is working just fine. No filters needed.