Air purifier?

[mindgamey]

Yes it will work, but inefficient when using 2 fans. 2 HEPAs in series is a lot of air impedance, better to use one single thick piece.
And the wooden enclosure will cause yr AP to double up as a non-THX certified, kickass speaker

Actually 2 fans in series will work, 1 as a pusher fan, the other as puller fan.

See Xiaomi and balmuda.

Flow rate will be the same but static pressure will increase, great for thick hepa.

 

[mindgamey]

for AP with back intake try to place in enclosed room in this manner.

not too close or too far from wall. Find sweet spot

My experience with my Sharp A50 is that no matter where I put, there is still chance for air short circuit.

Intake and exhaust too close and intake pressure too high, it's a product packaging issue.

Ideal design would be Bamluda/Xiaomi/M8808A/IQAir type of packaging.

 

[Akai Ryu]

very iqair

 

[Akai Ryu]

My experience with my Sharp A50 is that no matter where I put, there is still chance for air short circuit.

Intake and exhaust too close and intake pressure too high, it's a product packaging issue.

Ideal design would be Bamluda/Xiaomi/M8808A/IQAir type of packaging.

packaging? u mean design?

 

[ralliart12]

They are ok, can get. But foc 3M mask, do not use for biohazardous use.

Alamak, & I just checkout another version yesterday: link. Maybe mine don't have PM2.5 filtration capabilities?

But, be it the version I ordered, or the version laironpark ordered, since these 3M filtrete aren't HEPA filter media, & they (3M) always advise to cover only 70-80% of the original aircon filter mesh, how effective are their "PM2.5-filtration"?

What difference are there in the TaoBao version(s), versus the local (Red packaging) versions?

 

[laironpark]

They are ok, can get. But foc 3M mask, do not use for biohazardous use.

Thanks. Will take note of the mask.

 

[mindgamey]

packaging? u mean design?

design is a very broad term.

An air purifier is actually very simple, it's just a box with a fan.

Packaging is how you put these components together, doing configuration layout. Same components can give you very designs because of how manufacturers package them.

In design terms, packaging is not the outer shell.

 

[Asakura]

tis is like xm trying to outdo balmuda lor lol

very iqair

 

[mindgamey]

tis is like xm trying to outdo balmuda lor lol

maybe they hired ex iqair designer cos xiaomi chief designer was from balmuda.

and if you ask an iPhone designer to design another phone he will still give you the same design cos in his head that design is the most optimized.

 

[Asakura]

those using iqair xiaomi balmuda and other AP with similar layouts, is the filter surface fully utilized? unlike those like ax40

 

[chuanz]

Does this work?
Can give some input or comments he he

Spoiler

LOL

Fan in series is ok. Take out one of the HEPAs bah? Since even H10 is 85%, that leaves your second filter taking care of 15% of the junk. Maybe just do up one piece of 60mm HEPA instead, more cost effective and probably lower pressure drop (vs 2x 45mm)

For the '10" ventilation fan' I'd assume you're referring to something like:
https://www.kdk.sg/products/ventilating-fan/residential-use/wall-mount/25alh.html
(835m3/hr in "no-load" configuration )
You'd need to cross check with the HEPA's pressure drop and max allowable airspeed. You'd probably not find any existing data on how well the ventilation fan will handle pressure drop so everything would probably have to be done empirically, i.e. trial-and-error.

 

[Akai Ryu]

design is a very broad term.

An air purifier is actually very simple, it's just a box with a fan.

Packaging is how you put these components together, doing configuration layout. Same components can give you very designs because of how manufacturers package them.

In design terms, packaging is not the outer shell.

perhaps ap design limited by the hepa design/shapes too.

The internal for front and back AP also...only part of the hepa utilized with some area not receiving max air flow from fan therefore good to rotate orientation of the filter whenever doing maintenance. Some have cavity while some totally flat.

just gonna put some activated charcoal packs at the internal cavity

 

[Akai Ryu]

for those who dont like 360 or flat hepa

 

[mindgamey]

those using iqair xiaomi balmuda and other AP with similar layouts, is the filter surface fully utilized? unlike those like ax40

I dont subscribe to what Fview's review saying that the air filter usage is basically the foot print of the fan.

If you remove the filter from your AP, you will notice an air gap between the filter element and the fan grill. This is like a airbox you find in a car engine system, to equalise the air pressure across the cylinders.

So unless you say the fan grill is directly next to the filter element, then yes, the filter surface is not fully utilized. The effect will be like what some bros here are doing or the air cannon (putting a square hepa filter one a circular fan).

 

[mindgamey]

perhaps ap design limited by the hepa design/shapes too.

The internal for front and back AP also...only part of the hepa utilized with some area not receiving max air flow from fan therefore good to rotate orientation of the filter whenever doing maintenance. Some have cavity while some totally flat.

just gonna put some activated charcoal packs at the internal cavity

Honeywell uses circular filters, but you dont see them design it that way.

IQair will squarish filter but they managed to do bottom in top out design.

It all depends on whether they want to do it

 

[Asakura]

yep Fview didn't say all, just one particular one that he opened up and there was no gap. the fan was (i think) directly just behind filter.

 

[Akai Ryu]

For those considering building a safe room out of your bomb shelter or even your entire flat from nuclear, biological and chemical attacks

https://vimeo.com/130155296

https://youtu.be/Rli5CAdVWsA?t=147

https://www.youtube.com/watch?v=oDwAO5f96z4

 

[Akai Ryu]

Honeywell uses circular filters, but you dont see them design it that way.

IQair will squarish filter but they managed to do bottom in top out design.

It all depends on whether they want to do it

yup...its always abt profit margin but end of day depends on where one place their ap as it will be influence by the layout of home and location of furnishing as well

 

[LFC25]

Two observations on the AX40 after used for more than a week.

1. fan speed on night mode is too low. Does not seem much of use.

2. dust and smoke sensors are not sensitive.


Just my 2 cents worth of comments.

 

[Asakura]

yea this night mode thing has been said many times... even in past few 2 pages