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Let me begin with saying I?ve never been a Michael Moore fan. Being a libertarian Conservative all of my voting life, I?ve for ages been in opposition to ?Socialized? medicine. However, firsthand expertise in the healthcare business the past 17 years indicates me our system of health care (comparable to our tax system and education system) is broken beyond repair. Today's building codes state spaces using furnaces will need to have means for getting together again combustion air as it used. Newer homes have ducting installed, during construction, thats liable to bring oxygen on the surface to a area close to the furnace. This ducting, usually called constitute air duct, or combustion make-up air, is sized according to the capacity in the furnace.