Automatic Door Bottoms

Protecting Doors

Effective sealing of under-door gaps.

  • Tested to BS476: Part 20 & 22 for 30 and 60 minutes

  • Reduces maintenance costs

  • Exceeds Building Regulation and DETR requirements

Providing an effective barrier against; draughts, rodents, noise, light, smoke, odours and fume, Intastop’s Automatic Door Bottoms also improve security by protecting against under door gap attack at a vulnerable position beneath the door leaf.

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Activated by the opening and closing action of the door, they employ low-force, which does not conflict with lock/latch/closer operation, and do not require costly electrical connection or threshold obstruction to operate. They are self-levelling in the closed position.


  • Works on smooth, hard and uneven surfaces.
  • Easy to install, ┬ánon handed and fully reversible.


  • Ensures staff and patient safety in the event of a fire by maintaining fire integrity of the door allowing safe evacuation.
  • Improves security by protecting against under door gap attack.
  • Saves against maintenance costs.
  • Provides an effective barrier against draughts and weather, insects, rodents and other vermin, noise, light and smoke, odours and fumes.

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Colours and finishes



Milled Aluminium finish.

Technical information



Morticed installations - measure full width of door.
Surface mounted installations - measure between the stops.
A wide range of sizes are available to suit doors from 475mm - 1220mm in width and standard lengths can be cut down by up to 125mm.

Order codeDescriptionLength (mm)Width (mm)
4301CRLNon-handed Surface and Semi Mortice838, 915, 1000, 1200up to 19
4131CRLNon-handed Surface and Semi Mortice838, 915, 1000, 1200up to 19
434ARLNon-handed Full Mortice838, 915, 1000, 1200up to 19
411ARLNon-handed Full Mortice838, 915, 1000, 2000up to 19
411ARL-DSAutomatic Door Bottom suitable for Double Swing Hinges838, 915, 1000, 1200up to 19

NBS Plus



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Please be advised we do not deal with private individuals.

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