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Tandem 300

Door air curtains with patented Tandem technology.

Tandem 300
Your benefits:
  • 38 % energy savings using patented Tandem technology

  • Minimal heating requirement with the same penetration depth

  • Valves (optional) can be concealed behind the casing

Key features

  • Short delivery times for our standard door air curtains
  • For controlled screening of cold air with open doors
  • Energy savings of up to 38% compared to conventional systems
  • Two stacked fan groups for ambient air stream and warm air stream (patented Tandem technology)
  • Improved use of space Workplaces can be arranged more closely to the entrance
  • Faster return on investment compared to conventional systems


  • Coanda effect to improve the depth of penetration of the door air curtain:
    - Ambient air stream pulls the warm air stream
    - Improved screening and higher installation heights compared to conventional systems
  • Ambient air stream acts as a back-up stream
  • Adverse energy-intensive turbulence occurs primarily between the outside air and the unheated ambient air stream
  • Adverse weather stays outside, thanks to the enhanced penetration depth between two parallel air streams of different temperature
  • High-performance copper/aluminium heat exchanger
  • Easily removable air filter (grade G 2 in line with DIN EN 779); easy to clean by vacuuming or washing
  • Anti-torsion mechanism for heating connections prevents damage to the heat exchanger when screwing in the valves; valves optionally available as accessories


  • Versatile use in showrooms and sales floors of all kinds, malls and public buildings
  • Wall or ceiling-mounted
  • Modular design enables multiple devices to appear as a single visual unit
  • Installation also possible with concealed withint the suspended ceiling
  • Lengths 1.25, 2.0, 2.5 and 3.0 m
  • Suitable for mounting heights of 2.7 to 3.2 m

... also good to know

  • KaControl system or electromechanical control possible
  • Integration in KaControl networks or building automation systems, such as BACnet, Modbus or LON possible
  • Special designs on request
Technical catalogues
Tandem 300 EC door air curtainsdownload as.pdf, 3,30 MB
Tandem 300 AC door air curtainsdownload as.pdf, 3,45 MB
Spezial Tandem 300 door air curtains, screen-optimizeddownload as.pdf, 2,68 MB
Cross-product information
Product overview, products available in UKdownload as.pdf, 4,79 MB
Overview product innovations 2017download as.pdf, 2,41 MB
Spezial hoteldownload as.pdf, 2,41 MB
Spezial Commercial buildingsdownload as.pdf, 2,17 MB
Spezial KaControl building automationdownload as.pdf, 794,90 KB
Spezial Logistics buildingsdownload as.pdf, 830,76 KB
Spezial retail chainsdownload as.pdf, 3,45 MB
Spezial sports halldownload as.pdf, 2,26 MB
Overview Heating and Cooling with Refrigerantsdownload as.pdf, 4,39 MB
Installation manuals
Vario and Tandem 300/385 Door Air Curtainsdownload as.pdf, 2,95 MB
Vario and Tandem 300/385 Door Air Curtains, Wiring Diagramsdownload as.pdf, 1,87 MB
Tandem 300/385 DE Door Air Curtains, as Ceiling Cassette Unitdownload as.pdf, 1,59 MB
Tandem 300 Door Air Curtains, with Electric Heater Coilsdownload as.pdf, 2,67 MB
KaControl for Door Air Curtainsdownload as.pdf, 2,48 MB
Building product declaration door air curtainsdownload as.pdf, 209,67 KB
Interseroh Recycling Certificatedownload as.pdf, 627,76 KB
TÜV Certificate ISO 9001:2008download as.pdf, 443,11 KB
EU Declaration of Conformity UniLine, Vario, Tandem door air curtainsdownload as.pdf, 1,06 MB
CAD drawings
Tandem 300 door air curtain, model size 10download as.dwg, 240,15 KB.dxf, 1,82 MB.pdf, 128,09 KB
Tandem 300 door air curtain, model size 15download as.dwg, 246,32 KB.dxf, 1,95 MB.pdf, 131,36 KB
Tandem 300 door air curtain, model size 20download as.dwg, 256,79 KB.dxf, 2,06 MB.pdf, 129,80 KB
Tandem 300 door air curtain, model size 25download as.dwg, 251,09 KB.dxf, 2,23 MB.pdf, 119,60 KB
Tandem 300 door air curtain, model size 30download as.dwg, 287,26 KB.dxf, 2,59 MB.pdf, 135,34 KB
Tandem 385 door air curtain, model size 15download as.dwg, 266,48 KB.dxf, 2,14 MB.pdf, 134,11 KB
Tandem 385 door air curtain, model size 20download as.dwg, 287,43 KB.dxf, 2,32 MB.pdf, 138,16 KB
Tandem 385 door air curtain, model size 25download as.dwg, 316,39 KB.dxf, 2,71 MB.pdf, 145,38 KB
Technical details

This table only gives you a brief overview of the technical data. If you are looking for a more detailed product description and further technical data, please use the technical catalogue. The product configurator and the calculation program will help you to find the right article for your selection.

KaControl recirculating air control accessories


wall-mounted room control unit, with integral room temperature sensor, only for use with C1 controller
Installation instructions: i385_kurz_kacontroller_int.pdf

Download specifications (.rtf)
Article no.:

Room temperature sensor

wall-mounted, surface-mounted, IP30, colour white RAL 9010

Is the KaController installation site suitable for a temperature measurement? - If it is not suitable, e.g. behind a curtain, then a KaControl room temperature sensor should be chosen for each group!
Download specifications (.rtf)
Article no.:

Serial CANbus card

For increasing the number of units in a single-circuit system to a maximum of 30 units, one required per unit
For increasing the cable length from the first to the last unit from 30 to 500 m
Download specifications (.rtf)
Article no.:

Article no.:

KaControl Building Management System

Serial Modbus card

Necessary for every secondary air unit!
Download specifications (.rtf)
Article no.:

Control accessories electromechanical

Speed controller

for continuously variable fan speed control, flush-mounted
Download specifications (.rtf)
Article no.:

Combined controller

for fan speed control and room temperature control, surface-mounted
Article no.:

Surface-mounted frame

for surface-mounted installation of the speed controller
Article no.:

Stage switches for fan speed control

5-stage switch

Installation instructions: i005_5stufenschalter_100925_100926_gb.pdf

Download specifications (.rtf)
Article no.:

5-stage summer/winter switch

Only for use in conjunction with thermoelectric shut-off valve
Installation instructions: i006_5stufensommerwinterschalter_100928_100929_gb.pdf

Download specifications (.rtf)
Article no.:

Cascade module

for the parallel operation of two electromechanical door air curtains via one stage switch
Download specifications (.rtf)
Article no.:


Thermoelectric shut-off valve

230 VAC, 3/4", for KaControl and stage switch!
Download specifications (.rtf)
Article no.:

Leaving air temperature limiting valve

3/4", temperature setting range 20 - 50 °C
Article no.:


Basic unit casing

powder-coated traffic white RAL 9016
Download specifications (.rtf)
Article no.:

Casing extension

powdercoated traffic white, RAL 9016
Download specifications (.rtf)
Article no.:


Wall brackets

made of sendzimir galvanised steel for wall mounting, powder-coated traffic white RAL 9016
Download specifications (.rtf)
Article no.:

Ceiling brackets

galvanised steel, powdercoated traffic white RAL 9016, for adjustable suspension from the ceiling
Download specifications (.rtf)
Article no.:


Replacement filter

with frame for basic unit, 1 no.
Download specifications (.rtf)
Article no.:


Connecting kit for unit extension

to connect several Tandem 300, powder-coated, RAL 9016 traffic white
Article no.:

How does Tandem technology work?

In addition to the warm air curtain, a separate fan group produces an unheated primary air curtain that has a greater penetration depth and acts as a "back-up" air stream for the warm air curtain. At the same time it acts as a separately layer towards the cold outside air: cold outside air cannot penetrate in and warm air cannot escape.

What is the "Coanda" effect?

The penetration depth and screening effect are both increased by the contraction of the primary air stream and the warm air stream without this needing additional energy. This also means that the units can even be fitted at a greater height.

How are energy-savings achieved with Tandem door air curtains?

An energy-saving of approx. 38 % is possible by the combination of:


  • Increased penetration depth caused by the Coanda effect
  • Unheated primary air stream
  • A resulting smaller volume of warm air curtain