Yes. The inlet air for combustion is provided by a 2-1/2" PVC pipe in these furnaces. In the condensing models, exhaust combustion air can also go through PVC as it is cooled to the point of not affecting the PVC. You can see these as two pipes exiting the foundation, one in a "J" shape and the other just going up and out into a 90.
We had one of these when we built our house in Wisconsin. It was tight enough that we also had an air to air heat exchanger as well. Dan On Jan 27, 2013, at 3:56 PM, clay monroe wrote: > The newer gas furnaces (mandated to be 90%) require a fresh air intake. I > think it is for combustion, but I would be inclined to add another fresh air > and have it go through a pre-heat to inject into the breathing space. Or add > some sort of equalizer for air pressure > > _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
