Retractable door seal, DDS 20, for wooden doors, Startec

  • Area of application

    • Protection against cold, draught and vermin
    • Reduces light leakage
    • soundproofing
    • smoke control
    • Fire resistance
    • Safes energy of air conditioning systems (see following example)

    Example calculation of energy savings:

    Door width 960 mm,

    pressure difference between indoor and outdoor 10 Pa,

    room temperature 25°C and relative humidity of 90 %,

    outdoor temperature 35°C and relative humidity of 70 %,

    floor gap 7 mm

    Without seal: leakage rate approx. 41 m3/h

    With seal: leakage rate under 2 m3/h

    The area of application in which the door is used is mainly governed by the sealing profile material (PVC or silicone). High quality, self-extinguishing silicone seals are used for fire resistant and smoke control doors.


    Retractable door seals are available with single-side or double-side release mechanism. Seals with single-side release (with double doors) are released on the hinge side or on the lock side, depending on the model. Double-side release always means release at the hinge side and at the lock end. With double-side release seals, the sealing profile is raised and lowered faster, which prolongs its life time considerably.


    The sealing profile is pressed automatically against the floor or engages with a threshold as the door is closed.

    Automatic door seals can be distinguished between retractable door seals and sill seals.

    Sill seals are always used in combination with a threshold, it is, however, recommended to use retractable door seals also in combination with a threshold in case of carpet fitted floors or butt joints with different floor coverings.

  • Installation types

    Automatic door seals can be fitted in different ways depending on the model and application.

    Full mortice fitted, With mounting bracket

    Full mortice fitted and face fixed


    screwed on

    Plug-fitted and/or glue fixed (glass)

    screwed underneath

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950.05.910 Dr.seal 630mm

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single-side release –, length 830 mm, can be shortened to 708 mm

950.05.913 Dr.seal 930mm

single-side release –, length 930 mm, can be shortened to 833 mm

950.05.914 Dr.seal 1030mm

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Product details
  • Suitable for wet rooms
  • Rustproof for interior mechanism

Area of application

For soundproof doors (DIN 4109)
for smoke control doors in compliance with EN 1634-3
for fire resistant doors in compliance with EN 1634-1


Carrier: Aluminium
sealing profile: Silicone, self-extinguishing


Carrier: Unfinished
sealing profile: Grey


With single-side or double-side release (optional)

Sound proofing value

51 dB with 7 mm floor gap

Sealing height

≤12 mm


For full mortice fitting
with fixing brackets

Installation dim.

Groove: 20 x 30 mm


For DIN left hand and DIN right hand use
Can be prepared for shoot bolt (optional)
Product Features

Supplied with

1 retractable door seal

2 fixing brackets with screws

1 release plate with screw with single-side release, 2 release plates with screws with double-side release


Retractable door seal, DDS 20, for wooden doors, Startec

double-sided release –

  • Single-side release

  • Double-side release

  • Single-side release

  • double-sided release

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