Airflow
The amount of air that the air curtain can drive through itself in a certain time (usually indicated on an hourly basis).
Performance is one of the main parameters that determine the efficiency of the air curtain. The optimal value of this parameter depends primarily on the size of the door to be blocked. However, when calculating, it is also necessary to take into account several additional issues: the width and general configuration of the door, the presence of a vestibule, etc. Specific recommendations for calculating the required performance can be obtained from special sources or heating engineers.
Air temperature increase (ΔT)
This indicator describes the difference between the air inlet temperature and the outlet temperature — in other words, by how many degrees the air temperature rises as it passes through the unit. The higher ΔT, the hotter the outgoing air will be and the more attentively it is necessary to observe safety measures.
More features
Additional functions provided in the design of the air curtain.
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Air heating. The ability to use the unit for heating the air. Despite their name, not all over-door heaters have this function — many of them are not heaters, but rather "air" curtains. It is because the main task of any curtain is to cover open openings, and not to heat the room. Nevertheless, air heating not only allows the air curtain to be used as a heater (additional, or even the main one) but also increases the efficiency of its main purpose in cold weather.
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Thermostat. The presence in the design of the thermal curtain of a thermostat — a device for adjusting the outlet air temperature. This function is found only in models with heating mode (see above); it allows you to adjust the temperature in such a way as to ensure efficient and comfortable operation of the curtain and, at the same time, avoid unnecessary consumption of electrical or thermal energy (depending on the type of curtain, see above).
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Overheat protection. The presence of a safety system that protects the thermal curtain from overheating during operation. Overheating can occur for various reasons: clogged or blocked air ducts, electrical circuit failures, etc. However, it is a sign of an emergency and can lead to unpleasant consequences — up to accidents with injuries to people. Special protection avoi
...ds these consequences: it turns off the device when the temperature rises critically.
— Remote control. Presence of the remote control in a set of delivery of an air curtain. The ability to control the unit from a distance is very convenient, and it can be especially useful for thermal curtains installed in hard-to-reach places — for example, at high altitudes, where it is simply impossible to reach without a ladder or other devices.Dimensions (WxHxD)
General dimensions of the over-door heaters. The amount of space occupied by the unit during installation depends on the dimensions, but also the dimensions of the space it covers — namely the width of the airflow (or height, if the flow is directed not down, but to the side). Most air curtains have characteristic elongated proportions, and the mentioned width/height corresponds to the largest dimension of the device.
Note that the width and height of the air curtain, in this case, are indicated for the standard installation method (see above): for example, devices installed on top will have a large width at a low height, and side ones vice versa. For models with universal mounting, the dimensions can be indicated in different ways, but it is usually not difficult to evaluate the characteristics of the flow in them if we take into account the elongated proportions described above — the largest dimension is usually the same as the width/height of the flow.
Features of choosing an air curtain in terms of dimensions (and, accordingly, the width of the covered space) also depend on the type of its installation. When mounted above the doorway, the width of the unit must be no less than the width of the doorway (and ideally, a little more, with some margin). If the curtain is installed on the side, it is enough that its height is 3/4 of the height of the opening — due to the peculiarities of the movement of heated air, this will completely cover the required space.
