As you can see in my Sig I have a lot of stuff , not including bathrooms, and other household app. How do I bring outside air in? My fireplaces are in an interior chimney so have no clue on how to get outside air to them... I am gonna try and add a outside kit for my pellet stove but 18 inches of concreteand brick is not fun trying to get through...my house pulls cold air in through my forced air system in the winter .. I have had an hvac company come and check it out and they said the system was fine with no leaks.... basically the air exchanger isn't airtight and it is pulling air from around the filter, if I block the vent it just moves to the next one . So I was wondering how the heck can I change the pressure in my house? I think I will be forced to leave Windows cracked this winter!?!