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Open Roads Forum  >  Tech Issues

 > Bad air quality--finally taped a house filter on the A/C

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road-runner

Oregon

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Posted: 09/17/20 01:17pm Link  |  Quote  |  Print  |  Notify Moderator

In the bad smoke areas the local advice is to get a furnace filter and tape it to a box fan. I've had several reports that they turn brown in a day, so they must be catching something. For the most part, stores are all sold out of the filters. If you're not in one of the high smoke areas you might not understand how bad it is. Outdoors has been a no-breathing-zone for about a week now. It feels to me like spending a day outside without a mask would kill me. An AQI reading over 200 is classified as "hazardous". Much of Oregon has been over 500 for several days, sometimes in the 700s.


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poppa

Dallas, TX

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Posted: 09/17/20 07:04pm Link  |  Quote  |  Print  |  Notify Moderator

pack up an move outta the smoke? kinda like comin in outta the rain, no?

msmith1.wa

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Posted: 09/17/20 09:59pm Link  |  Quote  |  Print  |  Notify Moderator

I have 4 box fans plus the furnace running in my house to filter the air. I am using MERV 8 filters which are not rated for small particles, but in just 2 days you could see the color difference. So they do work.

To the OPs question if you think your set up is too restrictive, provided you can find more filters, you could tape 5 together in the shape of a cube with one side open. So it looks like a open box, and put that over the ac. Still not attractive and will lower headroom, but when it is nasty like this you do what you have to.


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down home

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Posted: 09/18/20 06:42pm Link  |  Quote  |  Print  |  Notify Moderator

Our Mh is pretty tight. The air conditioners recirculate air inside the RV. Going down the road we get a lot of dust and everything else through the dash air intake to the ac
Newer models may have intake filter. Bad smokey air in the ac an air purifier sound like the better approach. here lately we've seen a number of ads for them on tv. May have something to do with the fires, I dunno.
Just a thought: one of your roof fans, an air filter taped over one and the fan control turned to pull air in. Good filter might catch everything and positive air pressure keep air with smoke etc from getting in anywhere else. I have not tried it and don'tknwo the percentages, so to speak.

* This post was edited 09/19/20 03:02am by down home *

wopachop

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Posted: 09/19/20 12:06pm Link  |  Quote  |  Print  |  Notify Moderator

down home wrote:


Just a thought: one of your roof fans, an air filter taped over one and the fan control turned to pull air in. Good filter might catch everything and positive air pressure keep air with smoke etc from getting in anywhere else. I have not tried it and don'tknwo the percentages, so to speak.
In my opinion thats a great idea!! Was going to do exactly what you described using the MaxxAir roof fan. I wanted to put a filter on that sucker.

Went a different route and drilled a 4" hole into my floor. Mounted a 4" blower and ran 4" pipe into my trailer. Blows fresh air that is filtered by a 4" automotive air filter.

wopachop

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Posted: 09/19/20 12:19pm Link  |  Quote  |  Print  |  Notify Moderator

poppa wrote:

pack up an move outta the smoke? kinda like comin in outta the rain, no?
kinda like having this song in my head all morning cause of you!! Had to come play it.
https://www.youtube.com/watch?v=ZmN9AE8Lz90

wopachop

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Posted: 09/20/20 02:27pm Link  |  Quote  |  Print  |  Notify Moderator

I tested the wind speed coming out of the duct at the end of the line. Did the stock filter, no filter, new filter, clogged filter which was a kneenex covering half of the opening with the stock filter installed.


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wopachop

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Posted: 09/21/20 12:04pm Link  |  Quote  |  Print  |  Notify Moderator

Any thoughts? Guess you have to trust me on the numbers.
Been wanting to ditch the stock filter since the first day i bought this trailer.

MEXICOWANDERER

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Posted: 09/22/20 12:36pm Link  |  Quote  |  Print  |  Notify Moderator

I left my Holmes HEPA 2 filter behind. It would filter dust, smoke, pollen and yes, Covid19 from the air. Not just "so much" but greater than 99.9%.

Yes, even the virus. All of it.

It was a large unit not all tall but every bit as fat as a wheeled battery charger.

The replacement filters are not cheap either.

But for unexcelled purifying a "HEPA 2" filter is the cat's meow.

Every few years we had a bloom of a nocturnal plant. Even with Loratadine, an effective oral antihistamine, I could not sleep. After I smuggled the Holmes filter, the symptoms stopped 100% and I ceased the medicine.

The stupid virus seems like it's going to be around long enough to almost justify the purchase a HEPA 2 filter, with fan. It takes a strong, well made blower to push air through the HEPA 2 media.

The EPA, the CDC, and JAMA has proven the effectiveness of HEPA 2 against the COVID Virus

It would filter out contaminated air from a fire, no sweat. It filtered out the intense aroma of a Night Blooming Jasmine just outside the bedroom window.

A rough guesstimate for cost, would place the cost for a 5 story 100 bed hospital at seventeen million dollars purchase and installation and fifteen thousand dollars a w e e k to renew elements. So that thought flies out the window, never mind Hazmat disposal of used filters.

HEPA 2 is a great option despite it's cost for RV use. I love how it filters out fish fry odors from the galley. It would take a half horsepower ball bearing squirrel cage blower and 20" square, filter element to satisfy the needs of a 35' 5th wheel trailer.

RayJayco

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Posted: 09/22/20 05:22pm Link  |  Quote  |  Print  |  Notify Moderator

In case that you are interested in just how bad the air is in whatever location, I often refer to this site:
https://www.purpleair.com/map?opt=1/mAQI/a10/cC0#4.06/33.55/-103.78
Use it like you would any map, scoot it around, enlarge and such...

Another good site:
https://earth.nullschool.net/#current/wi........face/level/orthographic=-92.88,37.54,464

Good luck and best wishes!


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