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Where is all the dust coming from? Julie 09-16-2007
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Posted by Julie on September 18, 2007, 7:03 am

>>
>> Where is all the dust coming from? What more can I do?
>
> When you had an HVAC company check your system, did
> the tech check for a leak in the return air duct. A
> leak in the return air duct would tend to draw a lot
> of dust into your home, especially if the air handler
> is located in the attic.
>
> [8~{} Uncle Monster

No, they did not.

This, however, might give me empirical evidence of the source of the
problem:

http://www.inspectortools.com/blowerdoor.html

Someone else here mentioned semiconductor clean rooms.
I used to be an engineer and had to go into them on occasion. If I
recall correctly, it was a class 10 room and directly over the
production areas, it was less than a class 1. Each overhead HEPA unit
(and there were a billion of them), cost over a $100K each.

But gaining admittance was an utter PITA. I hated going through the 10
minute cleaning process and getting into the bunny suits. I felt sorry
for the mfg operators that had to do this all the time.

Posted by Uncle Monster on September 18, 2007, 8:39 am
Julie wrote:
>
>>>
>>> Where is all the dust coming from? What more can I do?
>>
>> When you had an HVAC company check your system, did
>> the tech check for a leak in the return air duct. A
>> leak in the return air duct would tend to draw a lot
>> of dust into your home, especially if the air handler
>> is located in the attic.
>>
>> [8~{} Uncle Monster
>
> No, they did not.
>

The reason I asked is, it's often difficult to
seal the ductwork on the bottom of a horizontal
air handler. It can be easily overlooked during
installation and inspection if installer is a
little slack. A repairman may not even look at
it because he will assume that the equipment was
installed properly. I see it all the time and
the repair may require cutting into the side of
the ductboard to reach the bottom and seal it
from the inside. The access opening cut into the
side of the return air duct is a good way to get
to the evaporator coil for cleaning and if it
has been sucking in dust, it will need cleaning.

[8~{} Uncle Monster


Posted by clot on September 19, 2007, 8:12 pm
Julie wrote:
>>> Where is all the dust coming from? What more can I do?
>>
>> When you had an HVAC company check your system, did
>> the tech check for a leak in the return air duct. A
>> leak in the return air duct would tend to draw a lot
>> of dust into your home, especially if the air handler
>> is located in the attic.
>>
>> [8~{} Uncle Monster
>
> No, they did not.
>
> This, however, might give me empirical evidence of the source of the
> problem:
>
> http://www.inspectortools.com/blowerdoor.html
>
> Someone else here mentioned semiconductor clean rooms.
> I used to be an engineer and had to go into them on occasion. If I
> recall correctly, it was a class 10 room and directly over the
> production areas, it was less than a class 1. Each overhead HEPA unit
> (and there were a billion of them), cost over a $100K each.
>
> But gaining admittance was an utter PITA. I hated going through the
> 10 minute cleaning process and getting into the bunny suits. I felt
> sorry for the mfg operators that had to do this all the time.

I had major problems telling SWMBO'd that most of the dust in our
bedroom comes from us! Our clothes and also us shedding skin! I've given
up the hassle. :(


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