Door heater for industrial hall gates

Air curtains, also referred to as door curtains, are devices that blow a controlled flow of air into a door space to form an air seal. The air curtain can be located above or on the side of the entrance door or gate. This seal separates two different environments and at the same time allows a smooth uninterrupted passage and view through a door, gate or other opening. Air curtains help retain heated or conditioned air and thus contribute significantly to energy savings and increase the personal comfort of people indoors.

Air curtains are used in industrial or commercial operations. They also act as a filter and stop the penetration of dirt, fumes and combustion products as well as flying insects.

How does the air curtain work?


When switched on, the air curtain sucks in air from the interior. The air enters the air curtain device, where it is accelerated by a fan. The air thus accelerated passes into the overpressure chamber, where it is evenly distributed along the entire length of the discharge nozzle. The wing-shaped blades in the nozzle create an even air flow with minimal turbulence. The air is discharged through the nozzle and is directed in the form of a stream to the floor. Approximately 80% of the air returns to the intake side of the air curtain and 20% goes in the opposite direction. 

Novelty is the door curtain with electric heating GUARD 100E. With a length of 1100 mm and with blow to a distance of 2.5 m, it is an ideal choice for standard door sizes. An input of 3 kW is exactly what is sufficient to ensure thermal comfort in the transition zone. The appliance is the Plug & Play type, which means that you only need to connect it to the electrical supply and everything is ready. The air curtain has a built-in motion sensor and control panel. Can be combined with Panel Comfort to switch air flow speed.

Horizontal position of air curtains 



Vertical position of air curtains 



  • energy savings due to air transfer control,
  • energy savings due to shorter running time of the air handling unit or compressor,
  • reducing ventilation and air stratification,
  • increase the comfort of employees / customers,
  • reduce infiltration by flying insects,
  • does not impede the smooth passage through the door and does not impair visibility,
  • usable space is created in the vicinity of the door,
  • removes ice and haze in cold storage areas.

In recent years, the range of air curtains has undergone several fundamental changes, whether in the range of performance, technology used, regulation or design modifications. We currently offer gas condensing, gas or non-heating screens. Air curtains are a desirable addition to heating and cooling with a significant impact on the results of the entire energy system.


The role of air curtains is to separate the indoor and outdoor environments. Regardless of whether they prevent the escape of heat or the penetration of cold, or the ingress of pollution or insects, their effectiveness is defined by the volume and speed of the blown air. The stronger the flow of the larger volume, the better the result. For heating, an effective door curtain can save up to 12% of annual heating costs.

What needs to be taken into account when designing air curtains:


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1. pressure conditions in building 

  • other flow in building
  • pressure mode
  • suction method
  • the presence of other gates and doors
  • the existence of a chimney effect

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2. air movement

  • unwanted flow
  • proximity and location of the workplace
  • measuring workplace
  • place of welding


3. direction of heater blowing 

  • never downwards
  • blowing at an angle outwards of 10-40°
  • a slight pre-blow is essential
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4. gate opening

  • gate type
  • opening mode
  • opening speed
  • opening frequency
  • side effects



Expert inspection, professional installation and high-quality service are a guarantee. 

Example of wrong installation