Dual duct systems provide cool air in one duct and warm air in a second duct to provide an appropriate temperature of mixed supply air for any zone--an extra duct, however, is cumbersome and expensive.
Dual duct systems provide cool air in one duct and warm air in a second duct. This was to provide an appropriate temperature of mixed supply air for any zone. An extra duct is cumbersome and expensive. This is however.