Air purifier?

[WussRedXLi]

Impossible to sleep with that sound level.

Sent from Android Mobile using GAGT

Xiaomi low fan speed is 48dB. Compare with Samsung AX40 45dB at 323m3/hr CADR and Sharp A80 53dB @ 480m3/hr and 41dB @ 300 m3/hr.

 

[WussRedXLi]

Just finished watching this video.

You guys must really watch the duration from 15:00 min onwards.
Talked about the true impact of the HEPA grade in real life in polluted scenarios.

It mentioned that in China, the pollution is terrible. What is really important is not the grade of the filter (H11/H12/H13/H14/U15/U17) that really scrubs the air ultra clean, but the CADR. And the airflow spec matters more than the HEPA grade. Of course, you would not want to use a F7-F9 filter in an air purifier.

But the grades between H11 to H13 make little difference IN REAL LIFE simply because the airflow spec can be nearly infinitely ramped up. Good examples include Samsung AX60/AX70 or even the Sharp A80.

But in a clean air setting in a country with already seemingly excellent air quality as background levels, eg Australia, then you might be able to appreciate the ultra clean air filtration down to ultrafine particle sizes in special cases like those who have just done heart/stroke operations.

Like the IQAir HyperHEPA (0.009 microns tested), Airgle cleanroom 950 cHEPA (0.1 microns tested, think 99.9997%). Or the Amway Atmosphere with U17 filter, or if you do not mind the aesthetics, cleanroom FFU/Fan Filter Units with humongous U17 filters and 1100 m3/hr airflow can be gotten + shipped for under $500.

In Singapore haze exposure, it may vary from a benign 30 ug/m3 on a daily basis during haze months to mid levels 131 ug/m3 peaks like last year 2014, all the way to crazy 250-500 ug/m3 in 2013. So, who knows?

 

[WussRedXLi]

Wow.

Looks like it's already beyond the capability of the Sikorsky helicopter (rented from SG) and another heli that they own to water bomb the vast areas in Sumatra and Kalimantan.

It's gonna deteriorate all the way from now. Have until end Nov to play.

El nino, high possibility that it's Super El nino. No clouds to seed, you can use 100 tons of salt. Sama sama. Throw money into the wind.

 

[Mikl1984]

I'm surprised that the Sharp A50 is quite good as measured in the laboratory. Official spec is 306m3/hr airflow (not CADR). But measured CADR is 348.x m3/hr.
Filter size is just 399 x 245 x 37mm

Chinese guy tested KC-Z380 which isn't equal A50

It's bigger brother KC-A60(61) for Europe (Russia) or japanese variant KC-Z80
Filter size is also biggest for Sharp 450x249x38

Chinese variant of A50 - KC-Z280
Filter size is 400 x 247 x 38mm

Just repeat that I am owner of both A51 and A61

 

[WussRedXLi]

Chinese guy tested KC-Z380 which isn't equal A50

It's bigger brother KC-A60(61) for Europe (Russia) or japanese variant KC-Z80
Filter size is also biggest for Sharp 450x249x38

Chinese variant of A50 - KC-Z280
Filter size is 400 x 247 x 38mm

Just repeat that I am owner of both A51 and A61

Oh I see. We don't have the A60 here, but I think I recall we were selling a KC-840, 850 and 860 here in local retail.

The latest Sharp D series selling here is KC-D40 and KC-D50. No KC-D60 in local retail (not sure if Sharp has such a model). There is a KI-A60E though which they say is MAde in Japan (but not JDM/Japan Domestic Model obviously since its 220-240V), which costs like S$1299.

The KC-A60/KC-Z80 has the same filter area as the Sharp A80. Depth is the same @ 37/38mm for the originals. Looks like the A80 is trying to blast more air past the HEPA (high m/s speed through the media) @ 480 m3/hr.

But my guess is that's ok at least for local conditions since the peak occurs at 0.5-0.6 microns. The local authorities, the ministry of health, tested a 3M N95 mask and while it's rated 95% @ 0.3 microns (measurements would indicate it's closer to 90% region), it's 99%+ for 0.7 microns.... But that's electrostatic filter, though it'd be the same for HEPA since it's 0.3 microns MPPS/Most penetrating particle size.

But I also recall Sharp does AHAM testing/certification for its appliances. No time to dig those figures out, those who are interested in the "smoke rating" can go google.

 

[WussRedXLi]

Ok, post this.

Ok, I got the data for 1997 super el nino year.

If the ug/m3 concentration is difficult to read, check the visibility graph.

And this is the mass of the PM for haze. Starts from about 0.2 microns peaking at 0.5-0.6 microns.

 

[Mikl1984]

Oh I see. We don't have the A60 here, but I think I recall we were selling a KC-840, 850 and 860 here in local retail.

The latest Sharp D series selling here is KC-D40 and KC-D50. No KC-D60 in local retail (not sure if Sharp has such a model). There is a KI-A60E though which they say is MAde in Japan (but not JDM/Japan Domestic Model obviously since its 220-240V), which costs like S$1299.

The KC-A60/KC-Z80 has the same filter area as the Sharp A80. Depth is the same @ 37/38mm for the originals. Looks like the A80 is trying to blast more air past the HEPA (high m/s speed through the media) @ 480 m3/hr.

Sharp has KC-D60(61) model for some markets including Europe
But it's not interesting in comparison with KC-A60(61).
Less filter square, bigger noise, just one flow direction

BTW do you know what's mean all this 40, 50, 60, 70, 80, 90, 100 in models for Japanese brands (Sharp, Panasonic & Daikin)?

 

[WussRedXLi]

Sharp has KC-D60(61) model for some markets including Europe
But it's not interesting in comparison with KC-A60(61).
Less filter square, bigger noise, just one flow direction

BTW do you know what's mean all this 40, 50, 60, 70, 80, 90, 100 in models for Japanese brands (Sharp, Panasonic & Daikin)?

The D40/D50 is a fair bit more expensive locally than the A40/50, but i guess that's because the A series are being phased out.

I'm not sure what the numbers stand for, probably they are just some model line-up numbers.

I actually wanted to grab a second-hand KC-C100E last week (only $70), but decided against it as I prefer something without the humidifer as then it'd be more compact in size. Its the same league as 850 and A50

http://www.sharp.nl/cps/rde/xchg/nl/hs.xsl/-/html/productdetails.htm?product=KCC100EW&cat=217

 

[Mikl1984]

I'm not sure what the numbers stand for, probably they are just some model line-up numbers.

I made some research
Very simple - first digit correspond to max aiflow in m3/min
My
Sharp KC-A51 - 5.1 m3/min
Sharp KC-A61 - 6.6 m3/min
Daikin MCK70P - 7.0 m3/min
Another examples
Sharp KI-WF100 - 10.0 m3/min
Panasonic F-VXL90 - 8.7 m3/min

 

[WussRedXLi]

Yea man, perhaps.

 

[kendoarts]

With a new born baby at home, and the impending haze. Does it make sense to close all windows and on the air purifier? But if I do, the whole house feels as though it's stuffy and lack of air.

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[chuanz]

Not impending, it's already here.

Highly recommended to reduce new born baby exposure to haze as much as possible. Due to the weather here in SG quite hot, when use AP need to use with aircon as well.

 

[Mikl1984]

Yea man, perhaps.

For sure

 

[WussRedXLi]

With a new born baby at home, and the impending haze. Does it make sense to close all windows and on the air purifier? But if I do, the whole house feels as though it's stuffy and lack of air.

Sent from using GAGT

It depends in reality. Some older house types may have windows and doors that have gaps and do not have side seals etc. The newer ones are pretty leak proof. I live at high floor with 100% unblocked (not within 550m and still that's just a thin building) and there is high winds often, so any small gap = leakage. If one lives at lower floors + blocked by other HDB blockls

If it's during the day, then the frequent opening and closing of doors would serve as decent ventilation esp wit air conditioning coz that cold air in the room vs warm air outside gradient serves a bit to exchange the air (you know, you feel the cold air rushing out at the bottom while warm air rushing into the room at the top).

This ventilation serves to clear the CO2 and VOCs out. That said, most houses do not have a VOC issue, unless your house is BTO and newly renovated with new furnitures/cabinets and appliances like TV/comp/home theatre, say within 1 year of reno.

 

[WussRedXLi]

Not impending, it's already here.

Highly recommended to reduce new born baby exposure to haze as much as possible. Due to the weather here in SG quite hot, when use AP need to use with aircon as well.

Heh, I was about to say that.

It started in early July from 1st July, just that a brief bout of rain in Jambi region stopped it. And S Sumatra/Kalimantan hotspots weren't so established yet. Only very slight, but the PM2.5 spikes for a couple of hours each time were more than enough to be noticeable for most.

 

[WussRedXLi]

For Kendoarts,

Don't have to to worry too much for the newborn. The levels nowadays are still pretty ok, just be mindful not to expose him to too much like over 30 mins, esp when it's over 50 ug/m3. Check this or the 2015 Haze El nino thread for latest developments.

http://forums.hardwarezone.com.sg/eat-drink-man-woman-16/2015-el-nino-haze-thread-5115113-18.html

Chuanz's page good for trending. http://fuzzyview.neocities.org/fuzzy25.htm
Source : http://www.haze.gov.sg/haze-updates/pollutant-concentrations/type/PM25-1Hr

Check it 10 minutes after the start of the hour for updates.


Since it's a newborn, if you can help it, you can get a second AP and place it in the living room. Trust me, my youngest is 22 months, you'd need the second AP in the living room and it'll be useful. You don't need cleanroom 0.0000001 ug/m3 80 ACH conditions, 55 ug/m3 -> 15 ug/m3 is already excellent. Your AP + MBR can supply cleaner air.

Don't have to spend too much. Check carousell/gumtree for a near mint unit with near mint filter, later just go customise the Taobao filters.

----------------------------------------------------
If you have young children, do protect them. They'd do much better growing up in unpolluted air, as compared to, say, the "benefits" ingesting expensive tins of super branded milk powders vs regular brands. Serious.

http://www.scmp.com/magazines/post-...-daze-air-pollution-and-our-children?page=all

The impact is worse in children than in adults.

"One of the basic principles we know when we are handling health problems in children is that they have small organs which are growing day by day. So, all those cardiovascular, respiratory and lung functions need to be developed into maturity in health to prepare them for the demands of the future. If, however, they are exposed to things which are harmful, the effect is much more significant than if these systems are already fully developed. The implications are much higher and have a lifelong consequence. We have growing evidence that long-term respiratory and cardiovascular problems are strongly related to early exposure to environmental pollutants. The lungs and heart are immature in particular before primary school."

Dr Lee So-lun is honorary clinical associate professor at HKU's Department of Paediatrics and Adolescent Medicine. She explains why children are so much more vulnerable to these pollutants.

"Firstly, it's biological, meaning that the build-up of their body is different. All the organs are still growing and maturing during childhood. Any insult to growing organs causes a long-term impact, unlike in adults, who have mature systems. Plus, their body system cannot remove toxins as well as adults. Then we have to look at the lungs because that is where the air pollutants are going. Lungs are maturing in childhood and we know that toxins on growing lungs are harmful. Our immune system is also immature in childhood. So, if you have a toxin that interacts with a genetic predisposition, it can cause things like allergies and asthma.

"There are also physiological differences," Lee continues. "The lung wall in a baby is proportionally much larger than an adult's. This means far more pollution circulates through the system. Babies and small children also have tiny airways, so anything that aggravates them will have a far greater impact. Also, children are much more prone to mouth breathing, which stops their noses filtering dirty air. Children are usually much more active than adults, so they tend to run around breathing in much more polluted air."

Scientific studies show that mothers living in polluted areas are at greater risk of having babies with low birth weights and congenital malformation. Animal studies have linked attention deficit hyperactivity disorder (ADHD) and hyperactivity to early exposure to air pollution.


http://www.environment.ucla.edu/reportcard/article1700.html

 

[WussRedXLi]

I'll post this again. For infants, toddlers (and other susceptible/sensitive group people), it's best to keep it below the following limits.

25 ug/m3 24-hr average period (WHO and Australia recommended limits)
35 ug/m3 3-hr averaging period (States in Canada, air quality standards)

Remember, the above are levels for the general population and does not even make any mention of children.

Personally, I'd be mindful once it gets over 50 ug/m3 in 1hr.

Chuanz's PM2.5 webpage
http://fuzzyview.neocities.org/fuzzy25.htm

Source : http://www.haze.gov.sg/haze-updates/pollutant-concentrations/type/PM25-1Hr

 

[natsemaj]

Hi all, i am planning to buy a novita 611i.. and feedback from any users here?

Seem like the airflow is not bad, highest at 600m3/hr & power consumption 55watts...

i am in stuck between novita 611 and sharp A80

 

[chuanz]

Hi all, i am planning to buy a novita 611i.. and feedback from any users here?

Seem like the airflow is not bad, highest at 600m3/hr & power consumption 55watts...

i am in stuck between novita 611 and sharp A80

I have the 620, which seems to be the replacement to 611. IIRC they changed the fan motor for 620. Both are using the exact same replacement filters which is kinda small for the amount of airflow (620 is rated 500m3/hr max). I measured before for 620 theoretically can hit >480m3/hr based on air speed x outlet size.

The highest speed is turbo mode and the next lower speed is quieter but the air flow drop is also a lot (290m3/hr from 500m3/hr for 620, a 42% drop). I would prefer a more "linear" drop...

Now cannot find 611 in Novita eStore so I'd assume it's now discontinued. I got the 620 as they had a trade-in offer earlier in March this year and I was planning to get rid of my Honeywell 50250 anyway.

Sharp A80 is a proven work horse, just ask WussRedXLi

Are you planning to put it in your living room or bedroom?

 

[natsemaj]

I have the 620, which seems to be the replacement to 611. IIRC they changed the fan motor for 620. Both are using the exact same replacement filters which is kinda small for the amount of airflow (620 is rated 500m3/hr max). I measured before for 620 theoretically can hit >480m3/hr based on air speed x outlet size.

The highest speed is turbo mode and the next lower speed is quieter but the air flow drop is also a lot (290m3/hr from 500m3/hr for 620, a 42% drop). I would prefer a more "linear" drop...

Now cannot find 611 in Novita eStore so I'd assume it's now discontinued. I got the 620 as they had a trade-in offer earlier in March this year and I was planning to get rid of my Honeywell 50250 anyway.

Sharp A80 is a proven work horse, just ask WussRedXLi

Are you planning to put it in your living room or bedroom?

i plan to put in bedroom. but maybe sometimes bring it out to living room if needed....

i checked many places.. A80 stock not available ...