| 摘要 |
A method and system for distributing heated or cooled air from a central pressurized source through a plurality of ducts to a number of spaces utilizing a minimum amount of energy. Each duct has a selectable high-low constant volume fluid flow controller which determines the amount of air flowing into each space according to a thermostat located in that space. A ductstat in the bonnet of the central source maintains the temperature in the bonnet in a narrow ideal desired range.
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