Q: Tim, I've got a forced-air furnace. Several rooms in my house are cold in the winter and are hot and stuffy in the summer when the AC is on. Most of the rooms are comfortable. Why do you think this ...

GET IT RIGHT: Duct fitting construction has a large influence on its equivalent length and which air duct calculator setting you choose. The fitting on the left has a much higher equivalent length due ...

ASHRAE and the Air Distribution Institute (ADI) have launched a new duct sizing calculator. According to ASHRAE, the calculator allows HVAC air distribution system designers to more accurately size ...