@Kool ******

it's also only 400k tied up for a few months, not the 800k listed.

@John *****************

anytime the day before. So depending on your departure time it could end up just under 48 hours technically.

@Roberto ***************

I get that and appreciate the design. I in no way meant to take anything away from your product. It's quite impressive to have come up with such a simple but innovative product that can provide the same performance as ones 2-3 times or more expensive. Innovation does not always have to be more complex.

As I indirectly said there is a lot of sense to start with a simple bare bones and inexpensive product to start with, and perhaps add features, models, or new products such as your AirCheck Business.

@Paul *************

I perhaps misspoke when I said it serves no purpose. In a case such as pets and toddlers, if placed on the floor, it can provide protection. For a very large percentage of people it serves no purpose. I guess that's what I get for commenting in absolutes, as there are almost always exceptions to virtually everything.

@Micah *******

to keep it simple one sensor away from the unit could be used. This isn't like an engine where a failure to filter dust can lead to catastrophic failure. I know in automotive sensor placement can be critical, since the nature and turbulence of air/fluid flow can result in inaccurate readings.

Fan speed could be used to determine airflow, taking into account the reduced airflow as the filter restriction increases. A simple test setup could determine both fan speed control and filter life.

@Micah *******

one pre filter would be good for control of the fan. One pre and post filter would be best for the filter life, or cleaning interval. Although testing could provide an algorithm to predict filter life/cleaning based on pre AQ readings and fan speed. My experience is with construction equipment engine and cabin air intake and engine, transmission and hydraulic oil filtration. A pressure sensor pre and post filter to calculate the pressure differential were often used to determine when it either needed to be cleaned or changed. The issue is air turbulence immediately pre and post filter that may provide inaccurate readings.

@Garrett **********

that definitely may be the case. With the actual unit being so simple and compact there may be no good place to put the sensor within the unit that would have an accurate reading. I'm sure the more expensive units aren't accurate either unless you have good airflow in the room and around the unit. Like a fan or ceiling fan circulating air. Although one could have the AQ unit be separate and attached via a cord so it could be placed several feet away, giving a much more accurate reading of what the AQ is in the room.

Even though I love the design, my engineering mind has a hard time not looking at ways to improve. That and cost reduction is what I got paid for. There is something to be said about starting simple and cheap and building up vs complex and expensive and then trying to take cost out though.

As a former engineer I absolutely love the simplicity of this. All the extra material and cost for a fancy housing serves absolutely no purpose. It would be nice if it came with, or at least another model that had an air quality sensor and filter life indicator since I assume all that would require is a simple sensor and software. Still a great design.

You may want to check if you are eligible. I thought they started being more strict on who qualified, eg which type of visa you are on.

I believe it is 2 months before you apply for the extension too, not from when your current stamp expires. At Chiang Mai you will also only receive a 30 day under consideration stamp and although I'm not sure if it is required it is probably a good idea to keep it above 400k until you receive the remaining 11 months. So I guess in practice one may need the money in there for 3 months or so.