Filtered Positive Pressure To Keep Dust Level Down

MEXICOWANDERER wrote:
Jeezo, every drawer, toothbrush, dishes, even a bar of soap gets polluted. When it gets bad, the dust goes into the refrigerator. Bedding has to be taken outside, hung then whacked. I keep clothes in doubled lawn & leaf bags with two ties. A pail of water used with a rag soon turns to mud :(

I was thinking of something like a giant K&N filter to stop a lot of the dust covering a large HEPA 2 type filter. The foam can be washed and re-oiled, and the HEPA can have high pressure air blown in reverse to recover a few times. A gigantic big rig filter would work but they have an obnoxious chemical smell.

Read the Spicer Report, before ever again suggesting a K&N air sieve.

The Spicer Report condensed version

Full Spicer Report

David,

I assume you're talking about in your fixed residence? If so, you might want to search for what they use in Australia for the filters in their off road RV trailers. This same material should work in your residence. They probably have it pretty much nailed on what works best.

As for in RV's, we use unfiltered positive pressure quite often to keep dust out of the interior when we're traveling on dirt roads. We close everything up (including the cab's ventilation system) except for one vent in the roof, which is way up above the dust from our tires. We set a fan in this vent to blow IN and hence create a positive pressure so no dust can enter from down low where the road dust is. This seems to work pretty good in our RV - assuming we're not following another vehicle on these kind of roads - in which case there would be dust up high, too, where the roof vent is.

The old drum type humidifiers were good at "washing" air.

K&N might not be the best choice as a prefilter, but such a statement can cause a flame war.

I threw out mu K&N filter after putting a strong light to it and being able to read through its many holes, went back to paper filters after cleaning the dusty throat of my post filter throttle body.

Others might regale you with their huge MPG and HP increases with a K&N.

Internet claims, Imo, are meaningless.

Jeezo, every drawer, toothbrush, dishes, even a bar of soap gets polluted. When it gets bad, the dust goes into the refrigerator. Bedding has to be taken outside, hung then whacked. I keep clothes in doubled lawn & leaf bags with two ties. A pail of water used with a rag soon turns to mud :(

I was thinking of something like a giant K&N filter to stop a lot of the dust covering a large HEPA 2 type filter. The foam can be washed and re-oiled, and the HEPA can have high pressure air blown in reverse to recover a few times. A gigantic big rig filter would work but they have an obnoxious chemical smell.

MEXICOWANDERER wrote:
With a very tight rig (but not tight-enough) has anyone here tried a filtered positive pressure fan to keep cigar-ash fine dust from passing through window and door seals? It can take hours after journeying to sop up fine dust.

Got the wife on it. But she can't think of the name right now. (retired Hosp facility manger) she had schedule so air (and dust in air) from some patients rooms with weird diseases didn't effect other people.

"Negative air flow" to keep dust(and germs)out or contained to a certain area (or room). Takes elec to power equipment. Wouldn't take to much to make RV air tight. Used to be air planes door were tested to only tested to 12 psi over out side pressure. IE... good duck tape works OK. Not sure how opening RV door problem could be solved. Then again how do you like living in a plastic bag?

https://en.wikipedia.org/wiki/Negative_room_pressure

We usually keep clean best we can with Yuma's fine dust and when we move to higher humidity area, dust much easier to clean up.

You've got us thinking though.

I can put a filter on my intakes. Whether it is positive pressure depends on the fan speed I choose in relation to the exhaust fans.

The filter restricts airflow too much in hot weather. I'd need more surface area/ pleats and have the filter further from fan blades to help that.

There are imprints of dirt where the axial fans reside, and washing the filter reveals the surprising amount of **** caught, but cigar ash dust?.... Likely not effective on that, not until the filter is so loaded the fan can't move much air.

One interior fan i can put a filter on too. I use a few layers of filter media with an exterior of carbonactivated filter , and it does not take long at all for that one to show visible signs of collecting clothes lint and dust. I vaccuum it every week or two