Love almost everything with this. Much less expensive that similar systems I researched. The only thing I am sceptical about is that the basement air pumps out right next to where the "fresh" air comes in. I wonder how fresh the air coming in is - not sure how much of a difference it makes since product seems to work.

I modified it to fit 4" ducts (adapters at home depot / lowes w some insulation tape - since 6 " are huge and had no room for them.

UPDATE 1/18/2013

DONT COUNT ON THIS TO REPLACE A DEHUMIDIFIER. MY BASEMENT IS ABOUT 800SF. GRANTED I RAN THE DUCTS SOME 20 FT AND REDUCED AIR FLOW STRENGTH - BUT THE HUMIDITY LEVEL WOULD NOT COME DOWN UNLESS I ALSO RAN DEHUMIDIFIER.

I DID NOTICE MUCH REDUCED ODOR

I am using this to remove excess heat from a garage in Las Vegas where I am running 2 large commercial refrigerators . It has worked perfectly so far this summer, last year the temperature was unbearable. With this operating the garage now comes close to maintaining the outdoor temperature.

Working alone It took about 3 hours to install it, the directions were easy to follow. If possible I would suggest having 2 people for f the installation, one outside and one inside, working alone required a lot of trips back and forth. The only potential issue is that it does make more noise than I would expect from a couple of small fans. This is not a problem for me but it may have a negative impact in other situations.

I am extremely happy with this fan. I purchased a home with an approximate 1000sqft unfinished basement. There was no air flow in this area. The basement is dry but had the stail air odor. After installing this fan, within a day of venting there was little to no odor. After running the fan intermittently along with a cinnamon roll scenty the basement smelled just like home. There is a slight vibration I am working on but otherwise fan is great. Thank you Tjernlund for a quality product.

I picked this up to improve the air flow in/out of my workshop to help keep the humidity down.

When I built the shop, I didn't think about air flow and wound up with a humidity issue since it was sealed so tightly with foam insulation. As a result, when the A/C isn't running, my reloading tools start to rust - and that's a real problem.

The installation of this Xchanger couldn't have been easier. Basically, it boils down to cutting a hole in the wall, pushing this through, mounting the outdoor hood + indoor fans, and then sealing it up with foam and caulk. It took less than an hour from start to finish and doesn't require any electrical work at all since there is just a standard plug on the indoor portion.

Even though the install seemed solid there was an angled wall brace included; and, weirdly enough, it took me longer to figure that out and get it installed than it did the rest of the Xchanger. :)

For my scenario, I installed it with one fan blowing out and the other blowing in to help keep a supply of fresh air out there. In that configuration, this will move 90 CFM of air - which is far too much for my use (and it quickly became apparent that the A/C couldn't keep up). Also, remember that if both fans are blowing the same direction, this unit will move 180 CFM of air in or out of your building. (It's easy to swap the direction of the fans after the install.)

In order to solve the problem, I picked up a simple Infinite Cycle Timer Outlet (Found Here) and set it to run the Xchanger for only 1 minute on then 14 minutes off. (That may not sound like much, but the relative humidity in my workshop has dropped a solid 20% - and my A/C isn't working any more than before.)

I was previously relying on a hOmeLabs 30 Pint Dehumidifier (Found Here) which ran constantly and had to be emptied every 2-3 days. Now it's off more than it's on and doesn't even have to be emptied weekly - that's a huge difference. In addition, I monitor my humidity levels using a SensorPush Wireless Hygrometer with Alerts (Found Here) , and I've been amazed at the difference in relative humidity even though the outdoor humidity has actually been higher. My target humidity level is between 45-50%, and I haven't gone above that since installing the Xchanger.

I am using the included humidity control unit - which is set to run the Xchanger at any level above 40% RH. That means it should pretty much always run. The control unit is pretty cool because it not only lets you set the humidity level, but also has an individual power switch for each fan if you only want to run one.

As you can probably tell, I'm very happy with this Xchanger - but there are a couple of issues:

1) The included 'filter' is nothing more than a mesh screen and doesn't keep anything small out at all. In other words, it will keep a leaf from blowing in - but won't prevent dust. The result has been my workshop is dusty instead of humid - and I need to figure out how to fix that issue now. I'm thinking of trying an automatic HEPA air purifier (Found Here) - but I'm probably also going to try rigging a better filter onto the included screen. If Tjernlund (or anybody else) would offer a real filter solution for this I would purchase it in a heartbeat.

[*** Update 12/10/2017 ***]
It probably seems like an odd solution, but I picked up a couple of magnetic 120mm PC fan filters (Found Here) and just stuck them to the front of the fans on the Xchanger - and that seems to have completely resolved the dust issue. It's too bad I didn't think of that before investing in the HEPA air purifier; but, at least the air is always nice and fresh in there now.
[*** End Update ***]

2) There are 2 magnetic covers included to seal the fans when not in use. Personally, I don't plan to use them - but it doesn't look like they have enough magnetic strength to work anyway. Honestly, they barely stay put when sitting on top of the Xchanger - and won't hold at all in a horizontal position. They also won't stay flat even though I've tried to flatten them for several days by sitting them under boxes of ammo.

If you have a humidity issue that's caused by lack of ventilation, then I would highly recommend giving this Xchanger a try. Not only does it help with the humidity, but my shop feels and smells 'fresher' whenever I'm out there due to the increased ventilation.

I installed this kit along with SCP to exhaust cigar smoke and odor from my basement "man cave". Some fabrication included a new glass block basement window with vent opening to mount the fans along with about 10 feet of 3" x 10" duct installed between the drop ceiling and trusses. This effectively positions the intake grate directly over the seating area where the smoke will originate. This setup should completely turnover the room air every 30 minutes or so in the highest speed setting on the SCP but more important, 90% of the smoke is immediately exhausted out of the room. This configuration will allow 2 cigar smokers to enjoy lighting up simultaneously without significant smoke in the air, with only minor and temporary lingering effects of smoke or odor. I may also add a carbon filtering type (in-room) fan solution to absolutely remove all lingering smoke odor.