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Customer Discussions > Humidifier forum

cool mist or warm mist humidifier?

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Showing 1-24 of 24 posts in this discussion
Initial post: Oct 2, 2008 7:09:59 PM PDT
Dont know which to get? Any advice? thanks. j

In reply to an earlier post on Nov 8, 2008 12:36:25 PM PST
Bookwrm says:
From what I understand, cool mist ones work best for summer because they don't raise the temperature in the room. Warm mist humidifiers inhibit growth of mold and bacteria better than cool mist and do make the room hotter, so are best for use during winter.

In reply to an earlier post on Nov 16, 2008 4:38:01 PM PST
whysofma says:
It's a tough call:
Warm mist puts more moisture into the air.
Warm mist humidifiers won't produce a stale water smell.
Warm mist humidifiers require you clean the calcium off of the heating element.
Warm mist humidifiers rarely have a fan, but you can hear the water boiling or simmering.
Warm mist humidifiers emit hot steam, which may or may not be a safety concern (for kids or pets).

Cool mist humidifiers have a fan, which may be annoying or soothing depending on your preference.
Cool mist humidifiers passively humidify the air which means the room can only get so humid.
Cool mist humidifiers often have a paper/cellulose wick, which must be replaced every few weeks.

You can also get an ultrasonic which is more expensive, and requires more expensive (than cool mist) filter cartridges (replaced every 2 months). But they are quiet, require the least amount of maintenance, and put a lot of humidity into the air.

So I'd say:
1-if price is no concern, get an ultrasonic unit. Just rememeber, if you run it every night, you'll probably go through 2-4 filter cartridges every winter season, which probably starts at an extra $50 and goes up depending on brand.

2-if maximum humidity is your concern, get a warm mist unit. You might have to clean them every 2-3 months, or you might be able to get away with 1 cleaning per season. Or at $20-$30 a pop, just consider it a disposable yearly item.

3-Cool mist is good if you are concerned about safety (generally for kids 2-3 and younger) or if you don't need serious humidity (or it's a very small room).

In reply to an earlier post on Nov 29, 2008 5:19:50 AM PST
Last edited by the author on Nov 29, 2008 5:42:50 AM PST
whysofma, great rundown on key points and advice. As you say it's a tough call - none really seem to address all the issues until you get to the $150-200 point or so.

Though saying that ultrasonics "require the least amount of maintenance" probably isn't true, due to the mineral and microbe issues they need a lot of attention to cleanliness - unless you get a high end unit. The least maintenance is probably a cheap warm mist that you replace every now and then, especially if you don't live in a hard water area - then the only maintenance is making sure the tray and tank are reasonably clean. (Unless you want something you can use winter and summer.)

Also, if someone figures out what matters first, it will probably be easier to decide:

- What's most important - noise, maintenance, price, child safety? If it's for a childs bedroom vs. an older couple's living room, the answers may be different.
- Do you have soft or hard water?
- Is it for winter and summer use, or just winter?

I'd add:

- Warm mist boils the water so largely eliminates microbes and minerals going into the air

(But unfortunately the child safety issue - not just the steam, but tipping it - can be decisive in not getting warm mist for some locations.)

- Ultrasonics can grow bacteria, mold, etc and will put that into the air. So they need more maintenance, usually, to keep them clean - though there are some that have UV or silver technologies to inhibit bacteria.

- Ultrasonic cool mist require using distilled water or demineralization in harder water areas, to eliminate the white dust problem

Also, it helps to be clear that some cool mist humidifiers are evaporative (a fan blows air over a filter/wick) and some are ultrasonic. They are often not well labeled, making it even harder to figure out.

Not all ultrasonics have a filter. Most cheaper ones don't, I think.

You need to empty the water completely (including the tray in the bottom) at least every day on the cool mist ultrasonic and evaporative models, and ideally on the warm mist ones as well.

IIRC consumer reports advises not having a humidifer if you're not willing to keep it clean, so that may tilt some toward warm mist. Also, don't humidy too much or mold and mildew start to grow, which create worse health issues than lack of humidity.

Air O Swiss and Germ Guardian have some humidifiers that address the issues - ultrasonic with both cool and warm mist, and silver or UV to kill bacteria - which helps reduce the risks and the maintenance. So if you're willing to spend $150 - 200 upfront plus ongoing filters, silver sticks, etc, and want a quick solution - get one of those.

Links and quotes: - worth reading

"Choosing a humidifier involves trade-offs among efficiency, cost, noise, and convenience. ... Don't buy a humidifier, however, if you can't commit to cleaning and disinfecting it regularly, lest you end up with more problems from mold and mildew than you started with from dry air. "

I don't think the conclusions and ratings on this are that on the mark, but it has some ideas and comments:

The author selected based on their own priorities, which might not match yours, so adjust accordingly.

In reply to an earlier post on Nov 29, 2008 5:20:52 PM PST
whysofma says:
Thanks for adding on to my post. I agree about your comments on getting a cheap warm mist unit. If I didn't have young children at home I'd get a new one every year or so.

Let me add this:
I have the Venta Sonic warm and cool mist ultrasonic unit. It's about the cheapest non-cheap ultrasonic with filter that I've found. Just 2 more points:
-It (and I think other ultrasonics) put A LOT more moisture into the air than warm and cool mist units. If you need to get your room humidified in a hurry, ultrasonic is the way to go.
-The warm mist feature on an ultrasonic unit is not the same as a warm mist humidifier (at least on mine). A warm mist humidifier boils the water to create steam. But the warm mist option on an ultrasonic unit heats the water to about 100 degrees. This is not hot enough to kill bacteria nor is it hot enough to scald you. I believe the purpose of this is to not drop the temperature of the room too much.

In reply to an earlier post on Dec 1, 2008 6:54:11 PM PST
Hi Jeff. I understand what all the other people's posts are saying but I will make it VERY simple for you. I WILL NOT sleep in ANY season without my humidifier. It is great and so low maintenance. It is a KAZ ultrasonic personal humidifier. They have it here on for around $50.00. (You may be able to find it cheaper elsewhere on the web) I found this exact model about 6 years ago or so on clearance at a Target store for $10.00 and it lasted 4 years!!! I found another one online then 2 years ago and it still works great. As stated, it is an ultrasonic humidifier, meaning you will see the vapor. I only use cold water in it. (never tried warm or hot). You only need to clean it about once per week (if using it everyday) with water and a little white vinegar--(cleaning the base reservoir, inside the water chamber and I even give a good cleaning to the inside shaft where the vapor comes out and the removable top) Cleaning well, you may notice a pink staining on the humidifier parts---this is bacteria---clean more often if you need to like I said with water and vinegar) No need to use distilled water in the unit. I use plain tap water everynight and it is just fine. I have become quite an authority on humidifiers and this is the best, cheapest and most low-maintenance one I have found. Also, I am a registered nurse and have recommended this unit to many patients. If filled up, it will last about 8 hours. No filters, cleaners, wicks, etc.... to buy EVER. My ONLY complaint is that it does not shut off on its own when empty so you have to use your brain and shut it off. However, if you do sleep longer and it keeps running, it will not hurt anything. I have slept longer at times and awoke to find it empty with the motor still running. I simply turn it off and its fine the next time I need it. Very dependable unit! (Gee, I hope you read this after all that!!!)

In reply to an earlier post on Dec 13, 2008 12:18:04 AM PST
I live on the high plains where outdoor humidity levels are often under 20% year round. Humidifiers are a MUST. I have come to the conclusion it is much better to use the humidifiers that can be purchased at discount stores than to purchase the high priced models. I use warm mist in the winter, cool in summer. I am using units I purchased at Wal-Mart 4 years ago. They are Relion, which is a label made specifically for Walmart by one of the big companies( I forget which one). They have to be refilled every 12 hours, the warm mist have to be cleaned of deposits every couple of days, the cool mist filter replacement is not a big deal, as only use those about 3-4 months each year. All of mine do have auto shut off, so I don't have to worry about the units overheating. I combat the hard water with about a quarter teaspoon of plain salt added to the tank on refill of the warm misters, does make cleaning the heating unit a little easier. I also add about a third capful of simmering oil to a couple of the tanks, gives a light fragrance to the air. Neither of these practices is recommended by the manufacturer, but I've been doing it for 4 years without problem. In summation, I spent about $150 for 3 warm and 3 cool units, have spent about another $30 for cool unit filters. I could have spent $150 for a larger cool unit, or $500+ for ultrasonic room size units and then another $300 + for replacement filters or silver sticks, etc. My only complaint is the water tanks aren't large enough. Would be nice to have to only refill once a day, but am not going to complain, takes only a few minutes and I alternate days to clean the heating elements. I went the cheap route, but have no regrets. All had one year warranty and are still going strong after 4 years, running 24/7.
If they all poop out tomorrow, I have surely gotten my money's worth. Another plus using humidifiers is how much plants love it. Lots of plants in the house eliminate the need for a $500 air purifier which would otherwise be necessary for closed up winter house. Kind of neat to have gigantic potted petunias blooming in December. Final summation, the $25 room size units and a few $10 potted plants work great for me.

In reply to an earlier post on Jan 25, 2009 11:27:58 AM PST
sawman says:
Why not a whole house furnace mounted humidifier? They can be purchased for less than $200 and installed by anyone who is the least bit handy. Save all your woodwork, furniture, and plants etc throughout the house, not to mention your skin and respiratory system. Increase the humidity and you can turn down the thermostat setting. A once or twice a year evaporative filter is cheaper than purchasing and throwing away $30 chunks of plastic right and left. Those advocating the pitching of barely used room units are sure no friend of the environment! Mix a bleach solution or vinegar and clean it and reuse it! Crimony!

Posted on Feb 6, 2009 9:32:15 PM PST
Mike D says:
We have a warm mist humidifier (vaporizer style by Honeywell), a cool mist humidifier (evaporative/wick style by Honeywell), and two ultrasonics (by Air-O-Swiss).

The warm mist is nice in the winter, makes little noise (very therapeutic gurgling sounds), and will never release any nasties into the air, because the water is boiled before turning into mist. Cleaning can be a pain if you have hard water, as the hard water mineral deposits will stay in the unit.

The cool mist is good in the summer (though we use it in the winter, too, just not in the bedroom), puts out a lot of humidity (more than the warm mist it seems), but is kind-of noisy -- sounds like a fan, because that's what it is: a fan blowing air through a water-saturated filter/wick. It has low likelihood of releasing nasties into the air: the minerals stay in the filter/wick, and if you do the needed maintenance (really easy) and some type of bacteriostat or "protec" cartridge, kills any bad things in the water. Cleaning is easy.

The ultrasonic is nearly silent, and puts out a visible mist, as opposed to an invisible mist like the above two. The humidity it puts out is a bit less than the other two. Also, water is more of an issue here, to ensure that nasties do not come out. Ultrasonic water mist can have bacteria on them, so you have to make sure that you religiously maintain the unit. Also, minerals can be deposited, leaving "white dust" everywhere. You have to use the included demineralization cartridge, or use distilled or reverse osmosis water. If you have softened water (like we do), the demin cartridge won't do anything, unfortunately, but will still leave white dust. Therefore, we use distiled water. Our ultrasonics have both warm and cool mist capabilities.

To summarize:

Warm mist pros: zero chance of nasties leaving the unit; relatively quiet; good in the winter; can use any kind of water without problems; good output of humidity.
Warm mist cons: can be hard to clean; not good in the summer.
Warm mist consumables cost: very very low: little filter pad every two weeks, which are sold 12 for $10 or so.

Cool mist pros: low chance of nasties leaving the unit; good in the summer; can use mostly any kind of water without problems; very good output of humidity; easy to clean.
Cool mist cons: noisy; not good in the winter.
Cool mist consumables cost: average: filter/wick replacement every two months, protec cartridge every month.

Ultrasonic pros: good in the summer; good in the winter (if you have a warm mist option); fair output of humidity; easy to clean; nearly silent.
Ultrasonic cons: bad in the winter (if you do not have a warm mist option); more particular on the kind of water you use; just a fair output of humidity; relatively higher chance of outputting nasties.
Ultrasonic consumables cost: average to above average: "silver stick" every year; demin cartridge every month or so -OR- distilled water (cheap if you already have a reverse osmosis filter, though).

Thus, there's no "magic" bullet with humidifiers. Which is one reason why we have all three types. :) Since we're in Phoenix, we can run our cool mist one in the wintertime, since even in the winter, the temp is pretty warm. We basically run the cool mist 24/7, the ultrasonic in the TV room while we're watching TV in the evening (since we're using distilled water bought at the grocery store, running it 24/7 is expensive), and the warm mist in the bedroom overnight (switched out with another ultrasonic during the summer time).

Brands we have (I've submitted reviews on Amazon of all these): Honeywell HCM-650 cool mist; Honeywell HWM-450 warm mist; and Air-O-Swiss 7135 ultrasonic. We've been happy with all three of these.

Posted on Feb 7, 2009 10:06:27 AM PST
Last edited by the author on Feb 7, 2009 6:47:05 PM PST
OrdinaryGuy says:
This is a very interesting, very informative discussion thread.
I agree with Mike D. There is no perfect humidifier. And those of us who depend on adding humidity to the air of our enclosed living spaces for health reasons will keep searching for at least a GOOD product.
I personally have found the evaporative, fan forced, type to be best for large living spaces....1,000 sq ft plus.
This type is noisy when left on high speed (which they have to be to cover a large space) and the motors tend to get even louder with time. The pros and cons are very well documented above. I've been using the new evaporative model Vornado in a large living space where noise and the forced cool air are not a huge problem. It's a little overtaxed for the square footage but will raise the overall RH 10 to 15% A Honeywell cool mist model I had prior to this was very effective but only lasted two heating seasons.
The bedroom is where personal preferences definately will dictate what's best for YOU. This is where you spend a third of your life and you most certainly want to do so comfortably. I prefer the warm mist type. Relatively quiet and actually help warm my bedroom on cold New England nights when the heat turns down.
First time humidifier buyers may have to try several types and brands to find what's right for them. They are definately high maintenance appliances but absolute necessities for some of us.

Posted on Feb 7, 2009 10:21:58 AM PST
Mike D says:
I completely agree with Ordinary guy as well. For maintaining a desired humidity in a relatively large living space, it it hard to beat evaporative-type humidifiers, which put out copious amounts of moist air with the disadvantage of noise. We have one in our dining room, which adequately maintains humidity in about half the house.

I also agree that personal preference dictates what humidifier you should have in your bedroom. In the cooler months, we also use a warm mist humidifier. In the warmer months, we use an ultrasonic humidifer in the bedroom, as its quiet.

We also have an ultrasonic humidifier in the TV room, where we spend our evenings before going to bed. The humidity from the cool mist unit does bleed over into the TV room, but does not not raise the humidity in the TV room to the desired level. So that the TV sound does not have to compete with a humidifier, we chose the ultrasonic for this application. Our dog also sleeps in the TV room when we're gone, and we've found that humidity ensures that he does not cough later.

The maintenance of humidifiers can seem forboding at first, but once you get into a routine, it's something that's easily done, especially when you have the routine memorized and don't have to keep reading the manual. On Saturdays I maintain all our humidifiers. The maintenance is probably less than an hour tops in actual work, although divided over a number of hours (I put the water tanks and removable plastic parts in the dishwasher on gentle, and soak the bases in vinegar or a humidifier cleaning solution; later I remove everything from the dishwasher, and rinse the bases well).

Posted on Feb 9, 2009 3:02:36 PM PST

Do you have a whole house humidifier? how does this compare to the others?

Posted on Feb 9, 2009 3:09:25 PM PST
Mike D says:
My issues with a whole house humidifier were two fold. First, because of the extreme heat in the desert, even our relatively average-sized house -- 2400 sq ft -- has two completely separate heating/cooling systems so that we could have two air conditioners. As such, the cost savings in the first instance is not that great, because we would have to have two whole house humidifiers in all probability.

Second, the larger issue I have with whole house humidifiers is that our furnance and blower are in the attic, which is a common thing in Arizona homes for whatever reason. Therefore, if there is any water leak, (1) it won't be easily detected for a long time, and (2) has the potential for causing a great amount of water damage before it is detected. This is why we went with the non-whole house humidifiers. YMMV.

Posted on Feb 9, 2009 4:03:14 PM PST
sawman says:
Well Nicole, I'm having second thoughts after installing a whole house humidifier on our furnace. I have a big issue with the fact that the furnace filter was found severely restricted in only eight days since the install. I usually go three months between changing the pleated filter. The Aprilaire 400A I installed does not have a flow through of water to wash away minerals(I wanted to save paying our expensive water) and I think instead of staying in the replaceable humidifier pad they blew out and deposited on the furnace filter. It now appears that although we'll save water we'll have to replace furnace filters much more often. I would exchange it for a flow through if I could. We also use an ultrasonic portable and filling it once or twice a day isn't that big a deal. Cleaning once a week isn't any trouble either. I think we'll continue to use it in the bedroom, it's quiet. As I was advised(and didn't listen) if you go for a furnace mount, get the flow through type, especially if you have hard water.

Posted on Feb 9, 2009 4:12:50 PM PST
OrdinaryGuy says:
In addition to Mike D's post, there is a third issue, or reason to not install a whole house furnace mounted humidifier (as sawman suggests). Simply can't if you have radiators.

In reply to an earlier post on Feb 28, 2009 6:28:21 PM PST
N. Snook says:
This doesnt really fit with your comment exactly, but it is along a similar line. If a whole house humidifier has a problem, it is a serious pain in the butt.

I have a friend didnt maintain the whole house humidifier and got mold throughout his house. It cost him tens of thousands of dollars to fix.

I'll stick with "cheap" humidifiers as another poster suggested, if they get mold there is little damage caused.

Posted on Feb 28, 2009 7:22:13 PM PST
sawman says:
To follow up, I found the furnace filter coated with deposits again within two weeks. I am uninstalling this humidifier and returning it. Will have to weigh my options, perhaps just use some of the units Mike discusses. Steam units for the furnace have been suggested but they seem to have their own problems. We have moderately hard water, 140ppm (as CaCO3). You may not have my troubles with soft water.

Posted on Mar 1, 2009 11:37:07 AM PST
Mike D says:
We purchased another ultrasonic humidifier -- Air-O-Swiss's 7144, which is a sleaker unit that their 7135 -- to put in the bedroom in lieu of the warm mist/vaporizer humidifier, because temperatures here in Phoenix are sufficiently warm that we're no longer wanting to heat the house up. Now that we're running two ultrasonics, I'm giving more serious consideration to (re)installing a reverse osmosis filter so that we don't have to keep buying distilled water to use in them. We can usually locate sales of distilled water to keep the price per gallon under 70 cents, but the hassle factor is immense in lugging jugs of water to the house from the grocery store . . . .

In reply to an earlier post on Sep 17, 2009 10:11:29 AM PDT
LisaLW says:
Hi Jeff,
It really depends on what you want in a humidifier. I have an evaporative humidifier and a warm mist unit. I would only buy a cool mist unit that has silver anti-microbial protection, because if it doesn't have this natural germ resistance, it will require a lot of cleaning so it's not propelling germs into the air, or it will require chemicals in the water, which would also be propelled into the air. Warm mist units generally boil the water before it's released and this kills the germs. I much prefer the warm mist during the winter in my bedroom, otherwise I feel the cool air from the unit and I don't like any more cool air in winter.
As others state, it depends on what features you are looking for, but those are my quick ideas.

In reply to an earlier post on Oct 18, 2009 8:47:44 AM PDT
reviewer says:
hello sawman,

what brand of whole house humidifier to dyou recommend? I would like to try this. ty

Posted on Oct 18, 2009 10:16:16 AM PDT
sawman says:
Sorry, I can't really help with a whole house suggestion. Because of the air filter clogging problems I incurred with one I returned it. The Aprilaire was otherwise OK but I would strongly suggest one with the flow through that washes out minerals if you get one. We just wouldn't be able to afford the water bill. I am leaning toward Mike D's solution of utrasonic room units and likely a reverse osmosis system for water as our's is moderately hard. Good luck, my skin is already drying up again for the winter!

Posted on Oct 29, 2009 9:11:20 AM PDT
I used to product for a work related video project. You can actually see it in use (briefly) here. It really humidifies a whole room and the warm mist function works better than the cool mist. This unit also looks very nice in pereson.

In reply to an earlier post on Nov 13, 2009 9:43:18 PM PST
B. Skinner says:
I just found out that cool mist/ultrasonic humidifiers can cause humidifier lung, where the aerosolized air-borne water particles can have bacteria in them that badly irritates the lungs. This happened to me and I thought I had asthma until I realized it was from my ultrasonic humidifer!!! I am currently looking to replace it with a hot mist one, so the steam kills and germs.

In reply to an earlier post on Nov 17, 2009 7:52:55 PM PST
Neil says:
> hot mist

The original humidifier, Made in America, was a hot-mist -- a Vaporizer.

I've played with vaporizers. When I was a kid, we had one that lasted 20 years. It had screws for disassembling the head. One day, I poured a cupful of trapped mineral deposits out of the head, scraped a little more off of the elements before putting it back together, and then it worked for another 10 years. Recently, I got a Vicks vaporizer that lasted 2 years, before the plastic in its (un-disassembleable) head started to make burning smells. I didn't wait for an actual fire before throwing it out.

There's also a meter called a "Kill-o-Watt (P4400)" that plugs into the wall, and your appliance plugs into it, and the LCD readout shows the amount of current the appliance is using. (About $20 on sale.) At the vaporizer's rated 5.8 amps, the amount of steam is unimpressive, although that's draining about 600 watts from your wallet. A pinch of salt to get you up to 8 amps gets a real good, effective head of steam, but then you're using about 1000 watts.

But I'm not taking any blame for burning up the vaporizer.

However, my point is that electricity-wise, a vaporizer is electricity-wasteful. And if your warm-mist humidifier is also boiling water, I would reconsider -- it takes a lot of calories, electricity, and money to turn water into steam. There's got to be another way.

More Cons: If you add too much salt (or if minerals have built up after frequently adding water), old-fashioned vaporizers spit hot water. Pour out some "dirty" water from the tank and replace with clean water to reduce water's electrical conductivity and stop spitting. When you get some serious steaming, a two-gallon tank will be empty before you're done with a night's sleep, and I think a humidifier loses a star if it can't make it through the night. Cheap heating elements don't last as long as when we were kids. Comments indicate ultrasonics are quieter than vaporizers.

I've never seen a vaporizer with a humidistat, so they have no regulation -- they put out more with a full tank, and fizzle out when the tank gets below 3/4 full. That's a formula for wasteful over-humidifying -- at least when the tank is full. Instead, I constantly tinkered with an appliance timer that turned the vaporizer on-and-off "automatically." As the weather varied, I kept adjusting the On/Off ratio to "regulate" the humidity almost up to 45%; then I used a [noisier] evaporative humidifier (Holmes-3500) to top the humidity up to 50% -- and the Holmes unit has a humidistat which regulates kinda okay. In practice, if the evaporative unit stopped coming on, I'd slow the vaporizer down a bit. If the noise from the evaporative unit started giving me a headache, I'd get the vaporizer to work harder.

One advantage of the HM-3500 is that it can hold 8 gallons. I only fill to about 3 gallons at a time, and either it has no tendency to smell, or the small squirt of mineral-dissolving additive I add to every 3 gallons is helping to stop the smellies. But I digress.

Pros: Vaporizers are quiet -- somehow they avoid making boiling sounds (unless they're spitting or close-to-spitting), and no minerals or germs are ejected into the air.


Yeh, I feel the cool breeze coming off of my evaporative humidifier when it comes on. And it's a lesson in tolerance when the fan starts talking. A nice system was when my HM-3500 and I used to live in a trailer. There was forced-air heating, and the air-intake for the system was in the middle of the trailer by a bathroom, but far from the living room or bedrooms -- and that's where I put the humidifier. I was far from the cool breeze and the noise. When the heat came on, it would suck up the humidity and distribute it throughout the trailer. But now I'm in an apartment, and the air intake for the forced-air-heat is in the living room. So is the HM-3500. It ain't pretty, but the humidity is within a couple percentages throughout the whole apartment.

Anyway, I'm getting excited about purchasing an additional, quiet humidifier so the somewhat-noisy evaporative unit doesn't have to cycle on as often. When it starts getting seriously colder outside, the noise will become more constant and make the purchase more urgent. Thanks for the thread and the recommendations.

You need to quantify whether your humidifier is having any effect -- or too much effect, and check your humidification regulatory efforts. I recommend hygrometer "B001AKCLVK." Search for that on Amazon.
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Initial post:  Oct 2, 2008
Latest post:  Nov 17, 2009

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