battle of aubers ridge

What rockhound just isn't acquainted with the red and yellow flowers, orbs, and poppies within this highly preferred cutting material? We have all 'ooohed and aaahed' viewing the slabs and cabs at gem shows. With each cut exposing a succession of unexpected patterns I have often been surprised at my finished gems, (though I would always say, "Yep, that is the look I was opting for.") A tighter built home means less outside air infiltrating in the home, which means less oxygen to use for combustion within the furnace. As the furnace burns fuel and oxygen for combustion, it "eats up" surrounding air, which has to be "made up" with fresh air. If air cannot type in the home as easily anymore, this can cause serious issues. As the surrounding air is utilized for combustion, rather than substituted with oxygen, a negative pressure inside the space can happen. This could create combustion problems for the furnace, plus burn up fresh air for anybody inside the home.