Air Supply and Ventilation Advice

Does anyone have one of these or something similar in their house?
http://www.chimkc.com/us_plusaire.htm

Are there other similar products that work well for auto balancing +/- pressure in the house that are worth looking into?

Thank you in advance.

-VB

Here are a couple more I found:

http://yourhome.honeywell.com/home/Prod ... BREEZE.htm

http://residential.fantech.net/resident ... r-quality/

Don't have one, but have seen them installed on the HGTV (This Old House) etc. shows. They seem to work, especially if you have a tight house (Spray foam insulation) etc....

What I think most of us coal burners need is an outside air supply to satisfy our constant combustion cycle. Why take warm air to supply air to your stove. Some have plumbed outside air to their stoves, this does 2 things. First it makes it so the stove doesn't have to draw from any leaks in the house if you have them, and second why take heated air for combustion? ""The Air to Air exchangers you where looking at are to refresh stale air in a house, such as a house with extremely tight insulation, they do not supply more air than they expell.to the outside.

ty Sierra, Wny

Has anyone worked or has opinion on "fan in a can" product.

http://www.waterheatinginfo.com/other-p ... -in-a-can/