Look closely at a large rectangular HVAC duct and its broad sheet-metal panels may appear perfectly rigid. But once the duct is operating, the pressure difference between the inside and outside can cause
Look closely at a large rectangular HVAC duct and its broad sheet-metal panels may appear perfectly rigid. But once the duct is operating, the pressure difference between the inside and outside can cause
In an HVAC system, a duct may look like a simple arrangement of sheet-metal sections connected together. But behind that seemingly straightforward construction lies one of the most important factors affecting system performance: