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It is clear that these two perspectives are going to draw swords against the other frequently. Although most people agree that efficient financial markets are best for everyone, the steps that government have to take to have there often run counter for the microeconomic interests of business. Sometimes a merger should be blocked to foster competition. Sometimes disclosures must be legislated to ensure consumers will make informed decisions. And sometimes certain activities should be regulated or prohibited to ensure that some are certainly not financially harmed by others. Today's building codes state spaces using furnaces have to have opportinity for creating combustion air because it used. Newer homes have ducting installed, during construction, which brings outdoors externally with an area nearby the furnace. This ducting, usually called make-up air duct, or combustion make-up air, is sized in accordance with the capacity from the furnace.