TTL Torluftschleier GmbH

You don't want to add any additional noise sources to your building and still use the climatic advantages of an air curtain system? Our LOW NOISE devices are specially designed for situations where additional noise is to be avoided. The main beneficiaries are banks and hotels, museums and libraries, shops and supermarkets, as well as clinics and residential facilities. LOW NOISE are the quiet feel-good air curtains from TTL.

Noise unconsciously stresses us throughout the day. For this reason, our LOW NOISE devices are particularly quiet and are designed to not increase the noise level in public facilities. Convince yourself of a technology that thinks ahead:

  • minimized noise emission with convincing device performance
  • sound pressure level is 36 to 53 dB(A) (corresponds to a quiet office or sales environment)
  • improved concentration and general sense of wellbeing
  • LOW NOISE devices are available in the TWISTO, AVANTGARDE, VIRADO, ORBIS, TREND and TWINORseries

Analysing the building situation

To specify the type selection, analyse your building situation and decide which installation variant makes sense.

Which air curtain is suitable for you always depends on the type of building in which the device is to be installed. The corresponding installation principle is then also decided. Taking stock briefly offers some clarity here.
The following building types are defined: 

Building type A
The room has door surfaces only on one side of the building and no connection to upper floors, which creates an internal thermal condition

As a rule, an installation according to the STE standard principles is sufficient.

Building type B
In the building, there are room connections to the top through an open extension over several floors. There are escalators, lifts or permanently open corridors, escape routes and staircases.

For this building type, an installation according to the AWE screening roller principle is recommended.

Building type C
Unprotected door surfaces are opposite or around the corner and cause draughts

In addition, the following points must be taken into account when selecting and installing an air curtain system:

  • Pressure situation in the building
  • Alignment of the door to be protected to the main weather direction
  • Door geometry - door dimensions

All basic conditions must be analysed and evaluated. More powerful units should be deliberately chosen for this situation and mounted according to the installation principle AWE or even better according to TWINtec - counter-current principle.

If you need help with the analysis of the building, our field service will be happy to assist you on request.  About the field service
Once the type of building has been determined, the installation occurs with the appropriate variant:

Installation variants


Dieser Doppelluftschleier vereint im TWINtec-Gegenstromprinzip die Vorteile der Einbauprinzipien STE und AWE. 
Er funktioniert durch zwei Gebläseeinheiten, welche zwei gegeneinander rotierende Abschirmwalzen erzeugen, die unterschiedlich temperiert sind. Die innere, beheizte Abschirmwalze (AWE) schirmt mit den Vorteilen des AWE-Prinzips ab, die äußere, unbeheizte Luftwalze im STE-Prinzip sichert eine stabile Abschirmung im äußeren Türbereich und trennt den Warmluftschleier von der Außenluft. Energieverluste werden so minimiert.

Bevorzugter Einsatzbereich:

Optimale Abschirmleistung bei allen Druckverhältnissen, passend zu den Typen A, B und C.

Planning principles

Room area

The larger the volume of the room or building, the greater the dynamic pressure on the building. This dynamic pressure causes a negative pressure, which is reduced above the door area, among other things. This means that there is an undesired exchange of air masses at different temperatures.

Exhaust height

The exhaust height is one of the most important criteria when selecting air curtain systems. The lower the unit is mounted above the ground, the smaller the amount of air is required to achieve a sufficient screening effect. In that regard, all architectural and technical possibilities should be taken into consideration. Low air volume means: low heating power, low noise level and low purchase and operating costs.

Room height

The room height in connection with the room area gives a characteristic value for the leakage of the room and thus for the design of the air curtain. This also applies in connection with thermal buoyancy.

A larger room area (room volume) generally results in an increase in leakage caused by doors, windows and leaks in the building. This increases the air exchange at the door. Due to these conditions and as a result of practical experience, the inclusion of the room size to be screened has proven itself for the design of air curtain systems.




Control - regulation

With TTL control units, air curtains can be effectively adjusted and regulated. In combination with modern electronics, the TTL air curtains are seamlessly adjustable. Remote control is possible via a 0-10-volt signal. This means that TTL air curtains can also be integrated into existing GLT and BMS systems in terms of control technology.

With the UBT plus and TWICS plus control units, TTL air curtains can also be controlled efficiently and as required outside of higher-level systems depending on environmental variables. This means that the air curtain constantly adapts to local conditions, even without intervention by staff.

The following controls are available for TWIN-LNS air curtains:

The universal controller with automatic programs or controller for autonomous power control especially for the double air curtain TWINOR


Console unit for power control of air curtains according to ambient conditions


Control unit for customer-oriented control or regulating tasks


Are you interested in a TTL air curtain?

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