Hepa bags. A gimmick?

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Kelton - First of all, thanks for the compliment. When I found out a few years ago I have allergies, I decided to become educated on indoor air quality so that I could reduce my symptoms. As a result, I am much more careful about cleaning practices, the quality of vacuum I use to clean my home, & I constantly have a Honeywell HEPA air purifier running 24/7 in my living room. I am currently using a 2007 Miele Callisto & a 2014 Simplicity Gusto.6, both with HEPA filters & HEPA Cloth bags, to clean my home, & both are immaculately clean & in pristine condition.

As for the Clean Fairy Kirby HEPA Cloth bags, I would agree with you - the result isn't "that bad". But, compared to the genuine Kirby HEPA Cloth bags, in my opinion they ARE bad....90 particles for the genuine Kirby HEPA Cloth bag vs 1400 particles for the Clean Fairy Kirby HEPA Cloth bag is a pretty big difference! That to me is unacceptable. If it had been under 500 particles for the Clean Fairy Kirby bag, that would be acceptable & make them a good alternative Kirby HEPA Cloth bag. If this bag was being used in a clean air upright with a sealed HEPA filter system, like a Miele Dynamic U1, Kenmore Elite or the Cirrus uprights, you could sacrifice the quality of the bag a little to save money buying generic bags, but when you consider this is the ONLY FILTER in a direct air upright vacuum, that isn't acceptable. And especially when there are plenty of other generic Kirby HEPA Cloth bags on the market by Envirocare, Crucial Vacuum, Zvac & VEVA that are widely available. If it's acceptable to you & Bill, more power to you & you can choose to use what you want. My personal preference though would to be use a better generic brand with better particle emissions, or just buy the genuine Kirby bags & spend slightly more for better air quality. I hope that one day Bill can get his hands on the normal Clean Fairy Kirby HEPA Cloth bags that are not infused with charcoal....I have to wonder if it's the charcoal layer that could partly explain their poor performance compared to the genuine Kirby HEPA Cloth bag. I appreciate your points though & contributing to the conversation here.

Mylesrom - You're right, NOWHERE did I say in my post that you said the quality of the Clean Fairy bags was equal to the genuine Kirby or Miele bags. All that I am saying is, based on Bill's tests of the Clean Fairy Kirby HEPA Cloth bag & my own experience with the Clean Fairy Miele FJM HEPA Cloth bag, I personally don't recommend the brand & will not use them again & I would suggest you try another brand. Based on what Bill experienced in his tests, & my own experience, it is highly likely those Clean Fairy bags are letting a LOT more particle emissions you cannot see than you think, even compared to the SVB HEPA Cloth bags you used previously. Considering your Kenmore canister either has no exhaust filter or has a HEPA filter in a unsealed system that can leak dust around the HEPA filter, that makes the quality of the bag used even more important. Even Kenmore noted in the certifications included with their vacuums that the particle emissions claims they made were based on using the vacuum with BOTH a HEPA Cloth bag & HEPA filter, because they knew their vacuums were unsealed HEPA filter systems. The ONLY VACUUMS they have ever produced that had a sealed HEPA filter system were the Kenmore Elite bagged canisters & uprights, the Crossover bagless uprights & some of their vacuums that were produced for them by Electrolux AB & were rebadged Eureka vacuums. And yes, you are correct about the seal on the bag holder of the Kenmore canister vacuums not having a perfect seal with the bag, but that's the reason you would tape the bag collar to the bag holder, so you maximize the seal the bag collar makes to the bag holder & the HEPA Cloth material has the best chance of capturing the fine dust & doing it's job of filtering the air. By the way, I have actually used the SVB brand Kenmore HEPA Cloth bags your vacuum came with, & actually found them to be pretty good for a generic bag. That is one generic brand I do recommend.

As for your statement that you would only use a Miele with their genuine bags & wouldn't chance using generic bags, I have used the generic bags with very few problems. They don't leak lots of particle emissions & cause problems with the motor like some people here claim they do. Plus, even though their filtration is obviously not as good as the genuine Miele bags, that is irrelevant since the Miele canisters are a sealed HEPA filter system vacuum. As long as the bag isn't leaking lots of dust into the bag chamber, it's perfectly fine to use generic bags because the HEPA filter on the exhaust will capture any particle emissions that escape the bag.

My experience with the generic bags has been the problems are mostly with the bag collar itself & it's design & quality, not with the quality of the bag material itself. If you read Amazon reviews on the generic bags, you can also draw the same conclusion. The generic bags that have the AirClean style collar used the first version of that collar that Miele only used the first couple years the bag has been made. The problem Miele had with the first version of the AirClean collar, & why it was changed, was that the bag installed properly in the holder & worked fine when first installed, BUT if you open the bag door to check on the bag, the bag collar becomes unclipped from the bag holder & slides up slightly in the bag holder. The consumer then closes the bag door without noticing this, the bag door tube doesn't penetrate the bag collar fully, & some of the dust & dirt goes around the collar & into the bag chamber. Even a fellow Vacuumland member who is a Miele dealer, Piano_God, noted in one of his posts that this was a issue with the first generation Miele AirClean / Miele HyClean bags & to be sure to push the bag back fully into the bag collar & make sure it clicks into place before closing the bag door. Since the generic bags up until recently used this first generation AirClean style bag collar, that is why consumers were seeing problems with dust leakage & didn't realize if they were more careful to make sure the bag was installed correctly before closing the bag door, they would have had no issues with dirt & dust escaping & the bag would work just fine for them. However, this problem is slowly starting to go away, since there are some brands of generic bags using the AirClean style collar that DO NOT unclip from the bag holder when you open the bag door, thereby lessening the chance of consumer error. I have also seen personally on some generic bags with the AirClean style collar that the silicone seal can detach from the collar, however you can always just change the bag if the seal does detach & it seems the quality of the silicone & the method in which it is attached to the bag collar has improved over the years, the recent generic bags I have ordered have not had this issue. The only other issue the generic bags have is they do not allow the vacuum to maintain airflow as well as the genuine Miele AirClean / Miele HyClean bag - the walls of the bag clog with fine dust & dirt & restrict airflow. However, that problem is easily solved if you take the bag out after each vacuuming session, take it outside, give it a good vigorous shake, & then reinstall into the vacuum. Doing that loosens the dust & dirt from the walls of the bag & restores airflow.

As long as you only buy generic bags that have the AirClean or IntensiveClean style collar & you make sure the bag is fully inserted into the bag holder & clipped into place, you will have no problem with bag leakage. I would strongly suggest avoiding bags with cardboard collars though - the collar can bend & warp, & not allow the bag door tube to insert fully into the bag collar, which can cause dirt & dust leakage. Even Tom Gasko, Dysonman1, has said he uses generic bags in his Miele canisters, in particular the 3M Filtrete bags with the IntensiveClean style collar, & he finds they work just fine & don't leak dust. Take a look at the bag chamber of my Miele Callisto....do you see any dust leakage from this generic bag?

Kenny - I totally agree with you. I don't think you can make a generalization that everyone's allergies are the same. There are people who's allergies are mild, & those that their allergies are severe. My only point is, as I said in my post, is it seems more kids these days are being born with allergies right from the moment they are born. And of course, we have no idea of what causes a child to develop allergies to certain chemicals, foods, grasses & other things in their environment. My whole philosophy when it comes to my health is that saying "A ounce of prevention is worth a pound of cure", meaning that if I can prevent sickness, disease or illness from happening in the first place by taking the best care of my body, eating right & exercising & taking the right supplements, I do it. So, since we all know indoor air quality is a concern due to dust & dirt in carpeting & various chemicals in the air from the products we use in our homes, I wouldn't want my kids if I had any exposed to dusty, dirty air from a vacuum & I would want a air purifier running at least in the family / living room of the home. I think it would be a good idea to take the preventative measure of using a vacuum with HEPA Cloth bags, a sealed HEPA filter system, or both, & if I was using a bagless vacuum to empty it outside. Having said that, I don't want my kids exposed to a "sterile" environment - I think it would be healthy for them to be exposed to allergens outdoors while playing & let them be exposed to "healthy allergens" in fresh, clean air, not toxic ones inside your home. Kids will be kids - let them go outside, get dirty, exposed to dirt, dust & allergens, let them get healthy exercise in, let them be exposed to allergens that way. I would just rather practice caution in the home in case they do develop allergies to some of the toxic chemicals in the air in our homes.

Rob







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It appears that many people forget

when discussing particle emissions is their own indoor air quality.

Example: Person "A" demands a fully sealed H13 level system and their typical baseline air quality is 100,000 0.3um. Won't really have any appreciable effect, right?

Example: Person "B" has an average home 0.3um of 1,000 or less, then I'd say nothing less than full H11 would be appropriate.

In my home, using "el cheapo" $2.50 MERV 7 HVAC filters, I usually sit around 10,000 0.3um; however, when my HVAC runs continually (peak hot/cold weather), I can see a home average as low as 4,000 0.3um.

Clean Fairy bags may be just fine for the average home and I'd bet most people wouldn't notice the difference.

As for the charcoal CF having some appreciable negative effect, I would venture to guess that since the Kirby charcoal HEPA and black HEPA bags both tested great (both under 100), the CF non-charcoal bag would also be similar.

Hope this puts things into perspective,

Bill
 
I'm glad Bill brought this up . . .

I was just about to point out exactly what Bill mentioned. All of this speculating on the possible inferiority of "generic" bags means nothing unless you know the baseline particle measurement for your home. If you haven't measured it, then you're just guessing.

For the record, I'm the guy who sent Bill those Clean Fairy charcoal bags after Kelton sent me a link on Amazon. They look exactly the same, so I thought there could be a chance they were made in the same Chinese factory, which would make the Clean Fairy bag a real bargain. As Bill discovered, they look the same, but the Clean Fairy bag has fewer cloth layers, so this probably explains the higher particle reading (and lower cost). Bill and I spoke about this at length and the takeaway was that the Clean Fairy bag is probably more than good enough unless you need to live in a highly filtered environment AND you have real measurements that confirm you have achieved this with your baseline air quality.

Anecdotally, I've been using the Clean Fairy charcoal bag for a few weeks now and I can't seem to tell any difference. I do not suffer from allergies, so I'm not as sensitive to this issue. However, I have a dog and I find the smell from non-charcoal bags to be disgusting. Even the Simplicity HEPA bags I bought from Tom at the (former) Tacony museum for my Ultra Premium started to smell after just a couple of uses. I have yet to find a non-charcoal bag, regardless of filtration, that doesn't smell awful after a few uses. So, as a pet owner, I'm on the charcoal bandwagon all the way. I haven't tried using granulated charcoal in a non-charcoal HEPA bag yet to determine if it offers better or worse "odor" performance. But, that is more of a hassle than just buying charcoal-infused bags. I suppose this could be yet another performance factor Bill could measure. Does someone make a "smell-o-meter" that could provide some insight?

Both the Kirby and Clean Fairy charcoal bags seem to offer similar performance. Maybe the Kirby bag won't smell quite as bad once it gets full. Maybe not. Until then, they seem to work just fine.
 
Adding charcoal

granules to a non-charcoal HEPA bag definitely works! This is what I do in my Cirrus upright and I was able to go 5 months without changing the bag. Had it not been for the charcoal, NO way would I have been able to go that long. A long time ago, I bought a big container of fish aquarium charcoal and I've hardly put a dent in the big container. But I don't think charcoal bags exist for the Cirrus upright?
 
Hmm

Charcoal is Overkill in my opinion.
Veva makes a better HEPA bag than Kirby. The hepa bags for TriStar isn't brand name.
People like charcoal bags it's a personal preference.
Everyone is entitled to opinion and preference for things. Some people are blinded by own convictions and proving their points. The person is so focused on proving point and being right they are oblivious to doing do changes how people perceive them.
If people are entitled to opinions they're also entitled to false beliefs.
Continually posting how correct you are you lose respect. Nobody is going to read 7 posts with half hour worth of videos. Nobody cares to listen to how someone is right.
It shows they are self absorbed and extremely insecure.
The continuance is not needed. It's sad to see going to the extreme it seems there Almost mad.
I wish people well but delusional self absorbed selfish people only concern about themselves and their correctness really need to step back and enjoy life get over insecurities and live.
You can come back I don't care. It's only my opinion and that is my right. I'm comfortable in my skin. I don't need reassurance from anyone.
Cheers carry on this wonderful thread.
Les
 
Hey Les, I do believe in the Kirby Charcoal Odor control bags. Our Golden fur in our old Hoover Platinum is what led me to this site and eventually to a Kirby with Charcoal bags. Before with our Hoover I literally needed to open windows when we’d vacuum. We brushed our dog regularly and she didn’t really stink up our home. Now with the charcoal bags I can go about a month on a bag before I’m smelling dog. Like you say though, to each their own. Do what you like and what works for you.
 
Kirby bb

Thank you for your suggestion. I may try a charcoal bag. The explanation makes sense.
Les
 
Kirbybb

I just had a thought. I read your post where you said you got a month on a bag before smelling dog? I'm assuming that's when u change the bag? If not, I wonder if you would try to suck up a tablespoon or so of charcoal granules and I'll bet a day later your bag will smell new again? What happens with my upright is after a couple of weeks.....I will start smelling a slight stale smell, I suck up a little charcoal, that lasts 2 to 3 weeks or more before I started slightly smelling anything, I suck up a little more......rinse repeat. It's like the next day after the charcoal has been sucked up, zero smell. I think the dirt eventually covers it up.
 
Thanks for that tip, I’d love to actually fill one of these bags up! I’ll look for some charcoal tablets and try it out.
 
MArk40511

I think adding the charcoal granules is a super idea if one has animals and the bag begins to smell way before it’s close to full.!
 
Brandon & Kelton

I have used granulated activated carbon in my vacuum bags, & it does work. But, you must wait until the bag starts to smell, & THEN put a couple of tablespoons of carbon on a flat surface & use the hose to pick it up. If you put the carbon in the bag when it is new before installing in the vacuum, all that happens is the carbon gets buried by the dirt. If the vacuum sucks up the carbon, then it goes directly to the dirt & to the walls of the bag, which is where the odor is - NOT just getting buried under the dirt where it has no odor reducing effect.

One other way to put a charcoal filter in a vacuum is to make a pre-filter. I have a Honeywell HEPA air purifier in my living room, so since it uses a charcoal pre-filter wrap, I bought a extra one & take the material & cut a piece of it to put in the vacuum's pre-filter holder in the bag chamber. Just make sure the charcoal filter is at the bottom & closest facing to the motor, with the vacuum's normal pre-filter on top of it for it to work effectively. If you go with this method instead of using granulated activated carbon, the filter needs to be replaced every 3 - 4 months, depending how bad the odors are & how quick the charcoal wears out.

Rob
 
I've read all your pros & cons, and decided to try to be a little more open-minded regarding the benefits of Hepa bags.

I've ordered some cloth-type Hepa bags, and charcoal-infused bags too.

Was Kirby's term "Micron Magic" their name for Hepa?
Has anyone tested airflow? Paper v Hepa.
Comparisons between the two?
Does Hepa leave larger particles behind in your carpets?
Anyone vacuumed with Hepa THEN again with a conventional paper bag to see whether much (if anything) was missed?

That'll be the first thing I'll do. Someone must have done this already.
 
O.K.  DO IT!  Stop posting about it and DO IT!  
What do you think we've all been talking about?  Have YOU EVER BOUGHT A HEPA BAG and tried yourself?  Or all you just wasting out time on VL?  


This is a tired subject!  


I DARE you to take the test yourself!  
 
No, Harley!  I tired of the bullshit that continues on and one from members like this!  It's like a dare to prove them right when all they want to do is argue.  I haven't time for that.  What's the point in their continuing?  For the fun?  Truth or dare anyone?
 
What

Why are you trying to hijack this thread. There is no need to swear. It's better to have people think your something than to open your mouth and leave no doubt.
I'm wondering how you are contributing to threads. I have noticed only complaining.

I dare you to stop being negative on threads and contribute on them.
Les
 
Well no-one EVER answers the ruddy questions, do they?
They just keep saying "I've got allergies"!

DO THEY REDUCE SUCTION?
ANYONE EVER COMPARED THE TWO TYPES? NO?
THEN WHAT MAKES YOU SO EXPERT? SOLD ON ADVERTISING, METHINKS.

YOU CAN SEE SUB-MICRON PARTICLES, POLLEN, AND DUST-MITES BEING LIFTED? WHAT'S LEFT BEHIND? LARGE BITS O' CRAP?


I'LL BUY THE BAGS.
I'LL TEST THEM.
I"LL SHARE MY KNOWLEDGE WITH YOU ALL.

If they work, you'll say "Told you so!".
If they don't, you'll say "I've got allergies!"
 
my 2c

Hepa bags typically increase the machine's airflow. Here are a few tested examples I also had a more extreme example with a Vita-vac (rebadged airway) where paper bags got a baird 4/10 and the hepas 6/10 if i recall correctly meaning about a 16 cfm difference. I think the surface area effects the increase, the larger the bag is the less of a difference it makes.
They typically increase airflow, and retain it better as the machine fills. With bypass machines there is also the benefit of less dust getting into your components.

Now this doesn't mean they're a must for everyone. I don't really have allergies but I always use hepa bags if I can cause they keep my machine cleaner and performing better.

As for testing using a pickup method, following behind a machine isn't really a good way to to gauge performance. Any vacuum following another one will typically find more dirt which gives the impression that the one after it is superior. I've tried this using a TOL Simplicity S40 and then following it up with a Simplicity Pixie stick vac, it found more pink sand after it, it doesn't mean it cleans better. A better way to do it would be to put an equal amount of dirt into an area and see how much of it is removed.

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rowdy141

I like your idea of those tests.... I don't recall reading any tests of the MicronMagic semi hepa/paper bags vs the cloth HEPA rated bags. You know the cloth ones HAVE to be better but it was a later design and the industry moved to the cloth ones ie rendering the earlier versions largely, obsolete (except for Collectors' of course).
K
 
The Royal B type HEPA cloth bags are not real easy to get here and expensive.I will have to check with the vac place here and see if I can stock up-like order a case of the HEPA Royal B cloth bags!Figure they may get discontinued along with the Royal metal vacuums.
 
Royal Hepa bags

Here's a good alternative, Vacuum America Clean Vac 7 Perfect P103, P104, P107, P108 / Royal Style B Uprights H-10 Hepa Filtration 9 bags for 17.99. I've been happy with the brand so far. I actually had a Royal L bag in my unit during the test. Mostly because the shop never sold a single pack of them in my time there. Figured I'd use them to get rid of them

https://www.ezvacuum.com/vacuum-ame...-uprights-h-10-hepa-filtration-pack-of-9.html
 
All My Kirby Bag Particle Test Videos

Particle Tests With Five Kirby Bags


Kirby MicroAllergen Plus HEPA Bag Particle Test


Clean Fairy Charcoal Kirby Compatible Bag Particle Test


Before I was on YouTube, I did some fairly extensive airflow loss testing primarily concentrating on HEPA bags for Kirby, Electrolux (Perfect) and Hoover (Crucial). When they were filled they did lose some CFM but the loss was minimal.

Here are some percentages all measured at the body of the machine (not power nozzle as I hadn't built my first airflow box yet).

75% Full Kirby HEPA bag lost about 10.7%
100% Full Hoover HEPA bag lost about 13.4%
100% Full Lux HEPA bag lost about 14.3%

Hope this helps,
Bill
 
Miele FJM HEPA Cloth Charcoal bags

Since there has been talk in this thread about the Kirby charcoal bags, I found these generic Miele FJM HEPA Cloth charcoal bags online. For those that don't want to use a generic Miele HEPA filter with the charcoal layer, don't want to use the Active AirClean filter with charcoal, or put activated carbon into bags or use charcoal sheets, these bags are a interesting option.

Rob












https://www.aliexpress.com/item/400...4.0&pvid=f4ffa8c6-184e-444e-b45c-852f32699143
 
bigger things to worry about ...

There's bigger things to worry about than vacuuming with HEPA.

Combustion stuff in the house is a big thing. Wonder why gas furnances & water heaters are required by most codes to vent outdoors now? CO and other nasty stuff used to just waft around as fumes in our homes! I remember growing up and my Dad working on the oil furnance -- there was no ventilation to the outdoors, it just vented in the basement. LOL.

There's loopholes in these codes for homes. Anyone cooking on gas / propane stoves should be venting _outdoors_, but I lived in an apartment built in 2000 that had a range hood that just recirculated the air. Hah! More combusted fumes to breath in.

A friend made me think twice about radon because he was buying a townhome with a basement. Radon causes cancer, my friend told me, and so I poked around on that. You can get a home test kit to check for it, but I've bought homes with basements where the seller refused to test for radon because they knew it would fail. Fixing radon is expensive.

Mold from wet basements / crawlspaces is another problem that I've fixed. Mold is pretty cheap to clean up but is also expensive in the long run. The includes a dehumidifier that's constantly running so the electric bill goes $$$!

So there's bigger things to fix in our homes -- like things that can literally KILL -- and folks think the air in the home is safe so they move on to fixing dust & pollen, but there's plenty of loopholes in building codes about indoor air quality. Dust & pollen don't kill most folks, unless you have a severe histamine reaction and I do not. So I'm focused on that big stuff.

I tried converting my Kirby 561 to paper/HEPA but the effort was too much and now I vacuum with cloth. I do use high MERV filters in my HVAC (>12) and that is to help reduce dust & pollen in our home. If you compare how often we vacuum to how often HVAC systems run -- that's 1 / week for me versus every 10 - 20mins for the heat/AC -- the frequency of HVAC's impact on indoor air quality is still much bigger than a vaccum.
 
A VENTED, top fill central vacuum cleaner with a flow through motor.  Just saying.


 


You can use any type bag you want, it won't matter because all the exhaust goes outside.  


 


Even if you live in an apartment and need to make a temporary vent through a window when using it, your health is worth it.

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Keith

As much as I prefer to vent a central vacuum outdoors, however in my humble opinion I feel like it is better to have a central vac equipped with a ActiVac III HEPA exhaust muffler. Not only you won't pollute the air outdoors but also you won't have neighbors to hear the noise of your central vac while running and you won't have bugs or insects to crawl the inside of your exhaust piping. There was a moment or two when I wondered why there were dead wasps or yellow jackets inside the motor compartment of our Eureka central vac which is vented outdoors, didn't took long to figure out that there was a wasp nest built right up where the end of exhaust is coming out at. And that's definitely a fire hazard if you blocked or clogged the exhaust piping of your central vac.

Also regarding central vacs with thru-flow motors in it. I would highly recommend to use only genuine bags, not generic. And/or I would highly recommend to use cloth bags, not paper. Otherwise without multiple layers of filtration, you would most likely to have bearing noises. That's one of the reasons why I'm leaning towards on getting the MD Modern Day M715h for myself that uses a bypass motor over the MD Flo-Master F650t that uses a thru-flow motor.

https://builtinvacuum.com/product/activac-iii-exhaust-hepa-filter/
 
I have a new, old stock MD Flow master I got 3 months ago.  It has a flow-thru motor.  In addition to using generic single port bags, it has about 3 inches of that woven foam at the bottom of the dust container to keep anything from getting into the motor.


 


I prefer flow-thru because you can vent  ALL air coming out of the CV and that includes the heat, carbon dust, and noise coming off the motor itself.  


With a by-pass motor, the only thing you're venting is the vacuum exhaust.  The motor heat, carbon dust, and noise stays in the house.


I wouldn't worry about finding a dead bug in the motor compartment or exhaust piping.  Obviously, if you'r using your vacuum weekly, they won't survive and will get blown out the line.  You can also get a self closing exhaust cover if that's really a big problem.


 


A flow-thru is quieter and you get more suction out of it compared to a by-pass.  A flow-thru motor is cheap to replace when the time comes.  I saw a new one just the other day for $39 on Ebay incl S/H.


 


This is my current temporary install. All I needed was a vent hole and a plug in my utility area.

[this post was last edited: 2/13/2021-19:21]

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subject of this thread

Hepa bags are nice, they are better than paper, though more expensive and they are not environmentally friendly.  They are after all woven plastic whereas a paper bag is paper and will easily break down in the ground.


 


In a Central vac. that's vented, a simple paper bag is all that's needed.
 
I have to second with Alex on this one... I have a few central vacs 2 of which are MD one is an Airmaster A-650 which has a flow-thru and the other being the Modern Day M715H the rest are either true cyclonic or filtered cyclonic. The power on the 650 is pretty good and I was very happy with it but there were a few things that I was not happy with. The M715h is more powerful being an 8.4" bypass motor. Although looking at the specs it has 7" more in water lift and 6 more CFM than the Airmaster and given the designs and differences there are a quite a few things that separate them. When it comes down to the Flow-Thru design and this comes from a technicians (me) point of view machines that are used with HEPA bags actually will last longer than those used with paper bags. Reason for saying that is because HEPA bags actually don't clog as fast as the paper and there is less debris getting through the HEPA material keeping the motor clean unlike the paper bags. The paper Bags are subject to bursting which I have had a few burst before, and they tend to actually choke off airflow after a certain period of time as to where the HEPA can maintain that airflow to allow for maximum capacity. Those pre motor filters in the MD machines are the consistency of buffing pads used on commercial floor buffers and could probably be used as one too so it most likely will stop the Large debris from entering the motor but will not stop the other fine material from doing so which could cause and is the leading cause of damage to armatures, brushes and bearings. Another thing is that the Flow-thru motors rely on good airflow to keep the motor cool as to where the bypass machines actually have a cooling fan on the top of the motor so regardless of whether or not there is a clog the motor will not overheat as to where the Flow-Thru will overheat and that could potentially cause damage and or be a fire hazard considering flow-thru motors tend to run hotter. Fire hazard being whether or not the thermal protection kicks in and I have seen a few Flow-Thru motors that have had that happen. Yes the Flow-thru motors are very quiet and would be my ideal choice if I were installing in a utility closet but the Modern Day machines are pretty quiet as well due to the rather large lifetime filter placed over the motor and are ideal for cellar/basement installs which is where mine is located. All in all I would recommend you follow the manufacturer's recommendations but it is your machine and your wallet so do as you please but when it does need a motor, don't buy some chineseium motor based on its price, especially if you want the same or more performance. There is a reason MD used the materials they used when they built the machine.
 

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