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GRILLES & REGISTERS: WARM-A IR L AYOUT TIPS How to lay out warm-air heating systems for comfort, quiet, and customer satisfaction. Many builders of energy efficient homes place great emphasis on "comfort" in their marketing. And many install forced-air heating because it allows them to integrate air cleaning, ventilation, and circulation along with the heating. But forced-air heating does not equate with comfort in the minds of many homeowners- particularly in the Northeast where hydronic heating is king. Many associate forced-air heating with drafts, noise, and discomfort- which is what a badly-designed forced-air system is likely to produce. But air systems can produce first-class comfort if the installer understands the basic principles. In this article, "Bud" Konzo, who helped develop many of the