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Doubel-Q Torluftschleieranlage mit einem geschlossenen Durchgangstor

"The Double Q®The system is the sum of 35 years of experience in horizontal screening."*


*Robert-Georg Falk, inventor of the Double-Q developed in 1987® Systems

The horizontal flow

Gate air curtain system (Air Shield System 4.0) stands for efficient atmosphere shielding in high-traffic passage areas

your benefits



Meets the integrated requirements of the Energy Saving Ordinance (EnEV) within the Building Energy Act (GEG).


High energy saving


Protection against cold and heat 


Minimizes the entry of dust, exhaust fumes, dirt and insects into the building


No more sluices, transparent PVC strip curtains, swing gates or high-speed gates necessary

Technical details


The Double Q® is an innovative, horizontal-flow system of the 4.0 generation.

The shielding units are placed at the entrance of buildings and fed by the external ambient air.

No heated or conditioned indoor air is used.


Thus, the Double Q® system is more efficient than a conventional indoor vertical flow air curtain system.


The Double Q® system can subsequently be placed in front of the exterior facade.

Doubel-Q Torluftschleieranlage mit einem geschlossenen Durchgangstor
Effiziente Luftströmung vertikalströmender Luftzug

Dynamically adjusted airflow.

Height: Gate height measured on site

Broad: 460 mm (incl. floor mount)

Power connection: 3 kW / column

Max. shielding width/column: 4 m

Volume (3m distance): At the max. power demand of the system 84 db (A)

Atmosphere separation in the door/gate area

Shielding of the outside
from inside against:
Shielding of the interior
from outside against:
  • Inflowing muggy, warm outside air in summer

  • Inflowing cold outside air in winter

  • draft

  • Dust, dirt and soot particles, car exhaust fumes

  • Fungi, spores, germs, viruses, bacteria

  • High humidity

  • Humidity too low

  • Unpleasant odors and putrefactive substances

  • Flying insects (flies, mosquitoes, moths, wasps, etc.)

  • Unpleasant noises (road and construction noise)

  • Inflowing warm indoor air in winter

  • Escaping cool indoor air in summer

  • Production-related unpleasant odours/smell of putrefaction/bacteria

  • Production-related particles/dust/air pollutants/gases/exhaust gases

  • Production-related high humidity

  • Production-related sounds/noise

Impressions of the use of the Double-Q®


Stay Informed

Thank you for your message!

sefa GmbH
Giesestrasse 30
D - 58636 Iserlohn

Phone    +49 (0) 2371 / 7711 180
Fax    +49 (0) 2371 / 7711 185
Send e-mail

Get in Contact

Many Thanks!

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