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Learn how a dual duct system works including dual duct mixing boxes and dual duct air handlers This design provides constant ventilation airflow to the zone by using a dual duct terminal with a separate ducted outdoor air system connected to the hot deck inlet. An ahu with a hot and cold ducts serving boxes.
The dual duct terminal unit varies the volume of the hot and cold decks as well as the discharge temperature of the terminal unit to maintain optimum conditions in the occupied zone. Dual fan, dual duct (dfdd) is a high quality system that can offer both good air quality and low energy use at low cost. By leveraging separate pathways for cool and warm air with thermostatic controls and a control system, it offers unparalleled climate customization within different zones of a building through the use of dampers and fan motors.
Johnson controls dual duct, variable air volume units vary the airflow individually between separate hot and cold inlet ducts for highly accurate temperature and comfort control.
The dual duct box has a mod for each deck (hot and cold) and both modulate to maintain space temperature With dual duct, both fans are operating and you have roughy twice the amount of ductwork. Provide quality comfort with quiet and controlled air flow and enjoy easy access for maintenance. One fan serves the warm air duct, and the other serves the cool air duct.
Tradeoffs between low energy use and good air quality are unavoidable when designing or operating most types of hvac system
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