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Old 09-16-2020, 01:48 PM   #11 (permalink)
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I visited a family with a huge custom dining table and a bench window seat. Maybe it is just because of how long the table is, but it is annoying to slide in and out if you are sitting on the bench, although I guess that is unavoidable if you don't have room for more.

They should also put some film on the window. I am sure that it is welcome during the cold months, but my back got hot while I ate there!

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Old 09-16-2020, 02:01 PM   #12 (permalink)
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Originally Posted by JSH View Post
So your evacuation order was lifted and the family is back at home?
Indeed. Air quality has improved to 400. We had currey and company last night. We split up between the table and just eating in the living room.

The night before I got Mexican take-out and chatted with a couple that has been without power for a week. They live in Scott's Mills. PGE cut the power pre-emptively and apparently hasn't turned it back on yet.

I'm curious to travel highway 22 and see the devastation myself. Perhaps this weekend. We were camping in Breightenbush the day before the fires broke out (left early due to smoke), so I'm curious if the campground still exists.
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Old 09-16-2020, 02:21 PM   #13 (permalink)
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Indeed. Air quality has improved to 400. We had currey and company last night. We split up between the table and just eating in the living room.
We decamped to Astoria on Monday. My wife has asthma and couldn't breath laying down Sunday night. (That is a sign her lungs were filling with fluid which turns into pneumonia) It rained on and off most of the day yesterday and the AQI dropped to 43 last night. It is back up to 115 at the moment.

I managed to find a MERV 13 air filter yesterday so when we return I can build a box fan air purifier.


(I couldn't find a box fan in Astoria or in stock online anywhere. Air filters also sold out, as are air purifiers)

Instructions for a box van version courtesy of the Confederated Tribes.
https://static1.squarespace.com/stat...ty+Program.pdf

Quote:
Originally Posted by redpoint5 View Post
I'm curious to travel highway 22 and see the devastation myself. Perhaps this weekend. We were camping in Breightenbush the day before the fires broke out (left early due to smoke), so I'm curious if the campground still exists.
We were in the Olallie Lake and Potato Butte area a few times over the last month. I'm curious to see how that area faired. According to the fire maps it burned.
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Old 09-16-2020, 08:36 PM   #14 (permalink)
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Two filters! I mentioned taping one filter to a box fan, but two?!
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Old 09-16-2020, 09:42 PM   #15 (permalink)
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www.grainger.com/.../kh-what-is-merv-rating-air-filter-rating-chart

Quote:
I managed to find a MERV 13 air filter
The pores are smaller. Doubling up halves the pressure required.

I've got a 1/3 HP fan blowing directly into a MERV 11 14" square filter. It bows out in the center as it clogs up.

The first filter, from March lasted 6 months, the second one lasted 3 days.
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Old 09-17-2020, 12:57 AM   #16 (permalink)
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Quote:
Originally Posted by freebeard View Post
www.grainger.com/.../kh-what-is-merv-rating-air-filter-rating-chart



The pores are smaller. Doubling up halves the pressure required.

I've got a 1/3 HP fan blowing directly into a MERV 11 14" square filter. It bows out in the center as it clogs up.

The first filter, from March lasted 6 months, the second one lasted 3 days.

I actually found 2 filters. They were the pricey 20 x 20 x 4 filters at about $35 each. Since they are 4 inches thick instead of 1 inch they have a lot more surface area so they should last longer than a 1 inch filter before clogging.

With that in mind I'm debating whether to use them both at once in a v shaped duct or one at a time in a square duct. Either way I'll have to make some cardboard ducting to adapt the square filter to a round fan. I'm thinking that if the smoke blows out of the valley this weekend as predicted I may be able to return one of the filters.

Thoughts anyone?

EDIT: This guy did some experiments with commercial vs homemade air purifiers.

https://www.shophacks.com/newsletter...tion-systems#/
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Old 09-17-2020, 01:04 AM   #17 (permalink)
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Quote:
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Two filters! I mentioned taping one filter to a box fan, but two?!
I could go crazy and do 5. (If I could find 5 filters)

As Freebeard said - the more filter surface area the lower the pressure drop. The filters also last longer.
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Old 09-17-2020, 01:15 AM   #18 (permalink)
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Quote:
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With that in mind I'm debating whether to use them both at once in a v shaped duct or one at a time in a square duct. Either way I'll have to make some cardboard ducting to adapt the square filter to a round fan. I'm thinking that if the smoke blows out of the valley this weekend as predicted I may be able to return one of the filters.

Thoughts anyone?
Presumably the filters are capable of filtering at least the same total volume of air in tandem as they are individually, so my assumption is to pursue the higher efficiency of tandem filters. The V shape appears to strike a nice balance of simplicity of construction and efficiency.

I'm the type to use filters until there's a mechanical failure with them. I knock the dirt out of filters routinely and then just place them back into service.

People have been mentioning that I should have new filters to more effectively filter the smoke laden air, but filters at least as effective at removing smaller particulates as they become filled with debris. The concern isn't how clean is the filter media, but how much impedance is there to airflow.
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Old 09-17-2020, 11:16 AM   #19 (permalink)
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Five filters would work as long as the bottom has airflow.
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Old 09-17-2020, 02:12 PM   #20 (permalink)
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Quote:
I knock the dirt out of filters routinely and then just place them back into service.
I've blown the dirt off with compressed air on the first one but I haven't reinstalled it yet, I've still got 4 in reserve.

My filters are from https://www.discountfilterstore.com/. Half a dozen at <$10ea. They shipped directly in March, I don't know about today.

There exists a 'dicountfilterstore.you-know-the-thing', but Brave browser won't left you go there.

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