As part of a solution I wanted a outside air vent/damper of some sort and asked for suggestions a few months back.
I want it for dead of winter running the wood stove when everythings buttoned down. The build is going great...getting close...dense blown going into the staggered stud on 2x8 plates walls this week.
Meantime..I found a very neat looking simple solution which is just the little bit of help (3" vent) I was looking for ventwise and figured I'd post it here incase others need a similar solution. 

Of all weird manufacturers for a passive device its "Panasonic"....same a my whispergreen continuos ventilation fan systems. 

 http://www.kitchensource.com/bathro...tm_id=1101


Hope it helps someone.
Mark

Mark-Nice simple solution... would it seem to you that this is going to let a continuious stream of cold winter air into the house. I assume this requires nothing to really work, just a simple passive filter vent. My only concern would be a major energy drainer.

Best is to vent supply air to or near the device that is exhausting the air. But otherwise air gets pulled through all the little leaks in the house - also a major energy drainer.

There is a lever on the side that slides up to open the vent and has a seal when its closed.
It is possible to open it half way also.It is tight when closed and seems real functional.
It will only be used while burning the woodstove which is occasional. Better than cracking a window. ;-)
Mark

Wow. Through this, you would be able to save a lot of space in your home. This solution makes your house spacious and wide.

link doesn't work? (at least it doesn't work for me!)

Yea - that is nice...  and they are proud of it... I wonder if it is compatible with 3" flex?

BTW - you say you are at the insulation stage and your getting close.... I look at the sheetrock as the 1/2  way point...  Installing the house numbers and/or mailbox is getting close....

Dense blown,T&G walls,sheetrock...all done. Mid Build blower door came in at 1.45 turn which was great. (Energy Star looks for 7 )
My HERS target is set at 50 so I should qualify for the tax credit. :-)
Putting in a 2nd fresh air vent...one that is fully automatic to protect against the chance of too much negative pressure.
Were getting there !
Mark

Sounds like things are doing well.  Congrats!  BTW - what is your primary fresh air source?   Do you have an ERV/HRV?  That is quite a tight house.

Another idea is to dump a fresh air duct onto the dryer room.  The idea is to put a regular flapper style vent on the inside so that negative pressure, like what might be caused by a dryer or wood stove would be relieved.  Maybe some day dryers (and wood stoves) will be available with fresh air intakes meant to be piped to the exterior - kinda a direct vent arangement....

Personally, I think its kinda bogus that a HERS of 50 is required for the energy tax credit.  It's hard to get there without spending a significant amount.  They should have some kind of graduated scale starting at maybe HERS 70.

I have 2 exhaust only continuos Panasonic fans...one in each bath...that with motion ramp up temporarily. The exhaust only strategy is sufficient for my model.
The fresh air vents are options I added because I am adding a small wood stove to use occasionally.

Mark