Forced-air

The supply plenum directs air from the central unit to the rooms which the system is designed to heat.

[1] It is much less common in Europe, where hydronic heating predominates, especially in the form of hot-water radiators.

[4][5] There are different designs of the self-balancing mechanism that largely determine the technical characteristics of CAV regulators: Typically, the regulator damper is made of lightweight aluminum, and the self-balancing mechanism consists of plastic levers and transmission, a steel spring and silicone vibration dampers, which are necessary to prevent auto-oscillation.

[12] Advantages: does not require large cross-sectional ducts, has a long spray range Disadvantages: require ducts with large cross-sections, it is necessary to reserve the supply unit and pump in the piping assembly, have a high gradient of air temperature over the height, have a small range of the jet.

[13] Advantages: presentable from a design point of view (only the grilles are visible), inexpensive (considering the combination with the ventilation system).