4 ms·
Some of the best air filtering systems (and also among the most expensive) are systems like the IQAir [1], which are essentially boxes with a fan at one end and
by danans 6y ago
Some of the best air filtering systems (and also among the most expensive) are systems like the IQAir [1], which are essentially boxes with a fan at one end and a series of filters arranged in an alternating diagonal pattern:
Note: / and \ are each separate filters
Filter
box
___
| \ |
Inflow --> / --> Outflow
| \ |
| / |
‾‾‾
This maximizes the filtration while reducing the static pressure, since the filtration is distributed over a large surface area.
Of course a lot of the high cost of installing such a system is the whole-house ducting. They also make single room purifiers, but there are also not cheap [2].
1. https://www.iqair.com/us/whole-house-air-purifiers/perfect16 https://www.iqair.com/us/whole-house-air-purifiers/perfect16
2. https://www.iqair.com/us/room-air-purifiers/healthpro-series https://www.iqair.com/us/room-air-purifiers/healthpro-series
EDIT: Corrected orientation of diagram
- ahaucnx 6y agoBe aware that some of the whole house systems might not have a fresh air intake. This can lead to relatively high CO2 levels inside the building and affect wellbeing and cognitive performance.
- danans 6y agoIdeally yes, they should have a fresh air intake connected to something like an HRV, but there is still value in dust/smoke/pathogen filtration even if the fresh air source for removing CO2 is a different one (i.e an open window). They are definitely better than no air filtration at all.
- Dylan16807 6y agoI think the filter is rotated the wrong way in your diagram? It looks like they use a normal pleated filter.
- danans 6y agoYou're right about the orientation. I've fixed the diagram. But they don't just use 1 filter, they use a series of them, like you can see at this timestamp of this video: https://youtu.be/8f6Ih09uaDw?t=401 https://youtu.be/8f6Ih09uaDw?t=401
- Dylan16807 6y agoOh, I see. That's a weird hack to get more surface areas instead of just using a deeper filter. All the pictures I could find were systems like this that do just use deeper pleats: https://images.allergybuyersclub.com/img/IQ-AP-HP-airflow.jpg https://images.allergybuyersclub.com/img/IQ-AP-HP-airflow.jp...
- danans 6y agoI could be wrong, but I think using separate filters distributes the air streams across independent filtration channels, reducing the static pressure of the system. Similar to a pleated filter, the angular orientation is probably about packing more surface area into a smaller space vs. parallel filter channels oriented linearly.
- ohyeshedid 6y agoI believe that's 6 filters in a chamber, not a zoomed in view of a single filter.
- rkagerer 6y agoHow do you think their standalone purifiers, like the IQAir Health Pro Plus, compare to the smaller Blueair Blue Pure 211+? The article measured a CADR on the Blue Pure of 325cfm, while some hits on Google show a CADR rating of 300 cfm for the IQAir one. I'm mainly interested in filtering pet hair, allergens, viruses and SLA 3D printing smells.
- TylerE 6y agoIt's important to not just consider the "max" number but what it's like while doing that. I have one of the BlueAirs (forget the exact model number, it's fairly large but not the largest). On any setting other than low (but espeically on high), it's quite noisy. Like, not just "I can hear this", but "I wouldn't want to carry on a conversation within 10ft of it".