Effective door sealing for comfort and energy efficiency
Doors without seals allow drafts, cold, and noise to enter living and working spaces. The gap between the door leaf and the floor becomes an entry point for undesired influences and drives up heating costs. The problem is exacerbated with exterior doors: driving rain penetrates, sound insulation is lacking, and energy efficiency suffers. Traditional solutions such as thresholds provide sealing, but prevent barrier-free access.
Planet drop-down seals from ASSA ABLOY (Schweiz) AG provide a remedy: they automatically seal the door gap when the door closes and combine energy efficiency with sound insulation – without structural barriers. The drop-down seals are suitable for new buildings and renovations – from wooden, metal, and PVC doors to glazed doors. For exterior doors, Planet X3 and zero thresholds offer threshold-free construction at the main entrance – the most important entrance for accessible buildings.
What is a drop-down seal?
A drop-down seal (also called drop-down door seal or drop-down floor seal) automatically closes the gap between the door leaf and the floor. When the door is closed, the seal lowers and seals the gap. When the door is opened, it lifts up again without dragging on the floor.
The result: effective protection against drafts, noise, moisture, fire, smoke, and heat loss – without thresholds, ensuring barrier-free access.
Why drop-down seals are essential for doors
Modern buildings must meet high requirements in terms of energy efficiency, sound insulation, and accessibility. Doors play a central role in this – but the gap between the door and the floor often remains a weak point.
Challenges:
Loss of energy: heat escapes, heating costs rise
Noise level: noise penetrates unchecked
Humidity: driving rain against exterior doors damages floor coverings
Fire and smoke protection: doors are insufficiently protected against fire and smoke
Accessibility: thresholds obstruct access
Thresholds: sealing exterior doors comes only at the expense of accessibility
Light transmittance: disturbing light gap under the door
A professional drop-down seal solves these problems.
Overview of the advantages of Planet drop-down seals
Planet drop-down seals from ASSA ABLOY combine functionality, easy installation, and versatile applications for greater living comfort and energy efficiency in buildings.
The advantages for you:
- Quick and easy installation: no complex modifications required – even during normal operation
- For new buildings and renovations: easy retrofitting on existing doors
- Versatile application: suitable for wooden, metal, PVC, and glazed doors
- Automatic balancing thanks to parallel lowering: self-adjusts to uneven and sloping floors
- Floor-friendly: no dragging across the floor
- Effective sound insulation: sound insulation values of up to 55 dB with optimal sealing
- Energy-efficient: reduces heat loss and lowers heating costs
- Barrier-free solutions: zero thresholds for threshold-free access
- Impervious to driving rain: certified sealing up to 9A for exterior doors
- Maintenance-free: durable materials for lasting protection
Which doors are suited for Planet drop-down seals?
Planet drop-down seals are suitable for almost every application – indoors and outdoors:
- Exterior doors (front doors, balcony doors)
- Interior doors (living and office spaces)
- Glazed doors (fully glazed doors from 8 to 16 mm)
- Sliding doors
- Fire and smoke protection doors
Planet X3: Overview of the entire product family
Find out more about barrier-free door solutions with Planet X3 and the innovative click threshold system – with all installation variants and technical data for your project.
Need Help?
Frequently asked questions about Planet drop-down seals for doors