Description: The Eastern Sheet Metal Equivalent Round Duct Calculator app allows sheet metal contractors, installers, HVAC engineers, and contractors to quickly convert rectangular and flat oval duct ...

With energy costs going through the roof and no relief in sight, HVAC system designers and specifiers are taking a much harder look at the many choices in ductwork available to them today. One ...

Q: Our house does not heat evenly. It is a 160-year-old Greek Revival structure. It has two stories in the center and a one story wing on each side. There is a basement under the center two-story ...