Outside freah air? > GreenBuildingTalk - Green Building Forums on Insulating Concrete Forms (ICF), Structural Insulated Panels (SIP), Radiant Heating, Geothermal Heat Pumps, Solar Power

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jbsgroup

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Posts:43

02/27/2002 10:53 PM
A Customers Question: W/ the Arxx Foam wall system & double insulated windows & doors, A customer asked for the need of outside freash air to be brought into a some what air tight building. We said this could be done by running a 4" flexiable suction line from the a/c unit to the soffit w/a door on it to shut of the outside air if need be. Any comments!

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Posts:2321

02/28/2002 12:37 AM
In my opinion (not even close to an HVAC person!!) it takes more than this. It will require a system that circulates and conditions the air - specifically designed to handle air from high moisture regions of the house. With the potential for condensation/mold/mildew problems in tight homes, I'd be a bit gunshy of an untested idea. You might check out the article at Journal of Light Construction site (link below). It deals with HRV units. There are also several good sites on teh web that deal with both HRVs and ERVs. http://www.jlconline.com/cgi-bin/jlconline.storefront/3c7dc1ad00eda6fa271b401e1d2906a8/Product/View/0201inst

markross

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Posts:1035

02/28/2002 9:21 PM
Assuming that the building envelope of the roof system is upgraded with vapour barriers, more insulation and such, you are now living in a very tight home, with very little airchange. Most codes in the north require furnaces to have a make up air source which is a 7" hole in the wall. Not enough. You need an air exchange system of some source, I doubt a 4" flexible duct will do it if all it does is try to pull in from the outside. Where is the air going to go once the building has been pressurized? HRV and ERV technology helps as well. I reccomend a visit to www.lifebreath.com for more info on air change. or our own site www.arit.com for info on indoor air quality. Mark Ross "Le Canuck"

jbsgroup

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Posts:43

03/02/2002 9:59 PM
Thanks, for all of your help jbsgroup

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