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.
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.
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.
Overview of the advantages of Planet drop-down seals
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
Product brochure: Drop-down seals for glazed doors
Discover the Planet KG series for fully glazed doors in all designs. The brochure shows you technical details and all available surfaces and provides further information.
Planet drop-down seals: solutions for every requirement
From barrier-free front doors to elegant glazed doors – Planet offers the right drop-down seal for every door. Discover our specialized solutions for different requirements.
Exterior doors: Planet X3 & click threshold system
Barrier-free zero threshold for front doors and balcony doors with maximum protection against driving rain:
- 7A/9A certified – no drainage channel required
- 3 simultaneous sealing movements (down, left, right)
- Modular click threshold system for new buildings and renovations
- Sound insulation value up to 52 dB
Glazed doors: Planet KG
Elegant solutions for fully glazed doors – design meets function:
- For glass thicknesses from 8 to 16 mm
- Suitable for fire and smoke protection doors
- Quick installation with mechanical attachment
- Surface finishes: EV1 colorless, stainless steel, or black
- Easy to retrofit – even on existing glazed doors
Interior doors: 8, 13 & 20 mm
Tailor-made drop-down seals for wooden, metal, and PVC doors:
- 8 mm line: for narrow doors and confined spaces (48 dB)
- 13 mm line: protected silicone lip, adjustable without disassembly (up to 55 dB) - the standard for wooden doors
20 mm line: for front door groove 24 mm or Euro groove 16 mm (up to 54 dB) - the standard for metal and PVC doors
Sliding doors: Planet SN
Space-saving solution with zero-force release – no door locking required:
- Release force only 1 N/m
- Stroke 7 to 16 mm, adjustable
- Automatic balancing for sloping floors
- Sound insulation value up to 44 dB
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.
Areas of application for Planet drop-down seals
Planet drop-down seals have proven themselves in a wide range of building types – from educational institutions to residential buildings and healthcare facilities.
Preschools & daycare centers
Barrier-free zero thresholds offer stroller-friendly access, prevent trip hazards for young children, and protect against drafts.
Education
Effective sound insulation promotes concentrated learning, while barrier-free door solutions allow all students unrestricted access.
Apartment buildings
Reliable noise protection between residential units and energy-efficient seals significantly reduce utility costs.
Public administration & authorities
Barrier-free access for all citizens and effective sound insulation create discreet spaces for confidential conversations.
Healthcare
Barrier-free access facilitates patient mobility, while hygienic sealing and odor control improve well-being.
Blog posts about Planet drop-down seals
New accessibility standard
Learn about the current requirements for barrier-free door solutions and how Planet X3 meets them.
Energy-efficient & sound-optimized buildings
Drop-down seals contribute invisibly to energy efficiency and significantly reduce sound transmission between rooms.
Trends in structural glass engineering
Modern glass architecture requires elegant solutions that perfectly combine design and function – the Planet KG series makes this possible.
More articles in the ASSA ABLOY expert blog
Frequently asked questions about Planet drop-down seals for doors
Get advice on drop-down seals now
Do you have any questions about Planet drop-down seals, or do you need help selecting a product? Our experts will be happy to advise you personally on your individual door solution.
