Case Fans

[Shadow Catcher]

I am in the process of either finding or building an air filter/purifier and in the process of looking for fans should I build my own, looked in my favorites and realized that there are case fans and there are CASE FANS, up to 360mm 14.17" 21Db 126CFM .50A http://www.coolerguys.com/360sf.html
In this case a potentiometer to vary fan speed would not carry too high a price in lost current.
There are of course smaller fans and since I have the 120mm three speeds will continue to use them.

[Trackstriper]

I think you'd find that you will need to go with a blower type fan that will handle the higher static pressure required to move air through a fairly tight filter. Maybe something like this from eBay:

http://cgi.ebay.com/1-x-Brushless-DC-Cooling-Blower-Fan-9733S-12V-0-2-0-5A-/180390841081?cmd=ViewItem&pt=LH_DefaultDomain_0&hash=item2a0021caf9

If this goes away then look up "12v blower fan" on eBay.

You could use a 3M Filtrete filter from Home Depot or Lowes and that would clean some of the stuff from the air, they make them somewhat small. Or poke around your local Wally World and you can usually come up with a replacement HEPA filter for some air cleaner at a reasonable price, I've seen some round Honeywell HEPA filters fairly cheap....they would last a long time in a tear. All you need to do is make a box or baffle and mount the blower to move the air. High air volume is not going to be required. We have a fairly nice portable air cleaner in our apartment and I think it moves maybe 100cfm in the mid-speed that we run it at. But that's for a whole apartment. There's not a lot of air to clean in a TD.

I will probably do the same for our cargo conversion.

[Corwin C]

They do make filters for case fans ... most of which can be rinsed in warm water and re-used. If you're looking for more filtration, perhaps a HEPA filter for a vacuum cleaner could be adapted. In my experience, most case fans are quite powerful and shouldn't have any problems with the reduced flow (your experience may vary.)

[Shadow Catcher]

What I have been thinking of is a combination of charcoal and HEPA to filter out smoke. I had great difficulty last year at Chain O Lakes with smog/smoldering camp fires. It was worse than LA many years back at its worst. I have looked at the Honeywell et, el, replacement filters.
We still do not have the trailer yet and until I have an idea of the flow from AC ducts (4") I will not know what exactly I need to do.