NK4 Warm

Champion Door offers many different alternatives for industrial installations and commercial properties, always taking into account the special circumstances of each doorway.

The tight structure of the door saves energy and increases employee comfort by preventing draught. NK4 Warm industrial door is a 2-ply fold-up partition like NK2 Double, except that two additional insulation layers for heat and noise insulation have been attached. NK4 Warm’s warm value (U) is 0.71 W / (m2 * K) and even 0.57 W/(m2•K) with additional insulation. With good thermal insulation, condensation of moisture on the door surface is minimal, and the door is highly reliable even in Arctic conditions.

NK4 Warm’s functional applications include aircraft hangers, shipyard halls, bridge crane openings and factory sheds. NK4 Warm’s excellent sound level attenuation properties also make it an excellent choice as an interior space divider. No size limitations.

Service concept

Champion Door offers a comprehensive service concept intended to make the acquisition and use of doors as easy as possible, all the way from the design stage to the maintenance service covering the entire service life. We offer our customers full support service starting from the design stage – for example, you may download ready-made BIM objects from our website to support architectural design. We also make accurate strength calculations and customized plans on a door and project specific basis. We can ensure the performance of our products by signing a maintenance contract with the customer and making the regular maintenance visits included in it.

Colour chart

RAL 9016
RAL 3002
RAL 3011
RAL 6000
RAL 6005
RAL 5005
RAL 5015
RAL 5002
RAL 5012
RAL 7035
RAL 7038
RAL 7037
RAL 7024
RAL 9011
RAL 8016
RAL 1003
RAL 1001 Beige
You can select the most suitable door colour from the colour chart. Thanks to modern fabric attachment techniques, several differently coloured fabrics can be combined in the same door. Special colours are also available by order. Please note that due to limitations in on-screen colour reproduction, the actual colour may vary from those shown on your computer monitor.
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NK4 Warm, technical information

General information

- CE-marked
- Meets requirements of EN 13241-1
- Wind load: any windload
- Maximum door size: no size limitations


- mildew-, UV- and fire-protected
- thermally insulated
- weight 900 g/m²
- Tear strength: 550/550 N
- Tensile strength: 4000/4000 N/5 cm
- Heat and frost resistance +70°C to -35°C
- Best functionality up to -35°C, arctic fabric up to -60°C
- Fabric options: windows, arctic fabric, soundproofing, security burglar protection

Other materials and surface treatments

- Upper console - hot-dip galvanized steel
- Side guides - aluminum profile
- Lower (bottom) beam - hot-dip galvanized steel
- Horizontal beams - aluminum
- Mullions - sandblasted, primed and painted (2 layers)
- Other parts - aluminum, nylon, stainless steel

Electrical system

- Enclosure class: IP54
- Operating voltage: 3x230/400 V 50 Hz
- Control voltage: 24 V
- Motor rating: 1 to 5 kW/motor
- Torsion: from 400 Nm to 4800 Nm/motor

U-value (door leaf)

0.71 W / (m2 * K) (even 0.57 W/(m2•K) with additional insulation)

Sound level

25 dB ->

rakenne warm eng