4D Function Doors

Multi-purpose doors

A multi-purpose door must withstand a lot over many years. The MZ multi-purpose door is sturdy, highly durable and weather-resistant and has been tried and tested for over forty years. It is ideal for both inside and outside. An MZ Thermo door with thermal break is also available and provides up to 30 % better thermal insulation compared to a conventional multi-purpose door.

• MZ Thermo46 / MZ Thermo65
  External door with thermal break and the best thermal insulation values. The multi-purpose doors are more than just extremely robust. Thanks to a thermal break, it features up to 49% better thermal insulation than a conventional multi-purpose door. It is available with or without glazing and in numerous colours and decor surfaces.
• MZ Multi-Purpose Door
  The stable and inexpensive internal and external door. Proven for over four decades, this multi-purpose door is stable, durable and weather-resistant, making it ideal for inside and outside. The MZ comes in a single-leaf or double-leaf design and is available with glazing on request.
• Multi-Function Door H3D
  The functional door between garage and home. Due to fire hazards in garages, a fire-rated door between the house and garage is required by law. The H3D multi-purpose door is the best choice for this sensitive area. On request, this door can also act as a seal against smoke and engine noise and additionally protects your family from unwanted visitors with the WK 2 package.

Safety protection doors

4Ddoors have the right protection door for every requirement – with standard equipment and a door leaf with an optional thermal break for top thermal insulation, e.g. as an external door for cellars, outbuildings and garages.

• KSI Thermo46 Protection Door
  High protection and the best thermal insulation. The KSI Thermo door provides many advantages: thanks to a door leaf with thermal break, it offers the best thermal insulation and also comes with break-in-resistant RC 2 equipment.
• KSI 40 Protection Door
  Additional protection with the proven classic. Basement entrances, outbuildings and garages are often equipped with old doors that can be forced open in seconds. Always remember: if the basement door is open, the whole house is accessible. This is why we recommend the KSI door with standard protection equipment for these areas.

Fire-rated doors

When it comes to fire protection, 4Ddoors is the expert – to your benefit: for doors in the boiler room or oil tank storage room, but also for the passage from the garage to the house. Your advantage: The fire-rated and protection door WAT can be matched perfectly to the internal doors inside your home.

• Fire-Rated Door H8-5
  The best-selling boiler room door in Europe. For decades, the H8‑5 fire-rated door has been providing optimum safety for boiler rooms and rooms with oil tanks. This door is the best example of how you can profit from 4Ddoors expertise in fire protection.
• Fire-Rated Safety Door WAT 40
  As a passage from the garage into the home. With standard fire protection and safety functions, the WAT is the right choice for the passage from the garage into the hallway of your home. With a thick rebate leaf design and numerous colour and design options, the door blends in perfectly with the other internal doors in your home.

Internal doors

Inexpensive and sturdy ZK internal doors are set apart by many advantageous features and can be used from the basement up to the loft. They are durable, resistant to stains, sturdy and close quietly and easily. They come in almost any colour and are ideal for modernising your home.

• Internal Door ZK
  The durable and inexpensive door. Over many years, ZK doors have proven themselves as robust doors for the interior from basements to the roof. ZK doors do not warp and come with a high-quality surface that is durable, resistant to stains and easy to clean. Reliable quality at a low price.