Double-Leaf Sliding Door — Wide Cold Storage Opening
Double-leaf sliding doors for wide cold storage openings — two door panels close from opposite sides to a central meeting point, delivering wide access with hermetic sealing on all four sides plus the central compression seal.
Double-leaf sliding doors for wide cold storage openings — two door panels close from opposite sides to a central meeting point, delivering wide access with hermetic sealing on all four sides plus the central compression seal.
The Prime Coil double leaf sliding door for cold storage is engineered for wide openings where a single-leaf door would be impractical — forklift traffic corridors, pallet-scale product movement, large chamber access, and any facility layout requiring openings from 2,000 mm to 4,000 mm and above. Every double leaf sliding door we supply uses two door panels that close from opposite sides toward a central meeting point, delivering wide access with the same hermetic 45° seal that has been the industrial cold storage standard for decades.
Why wide openings need double-leaf, not oversized single-leaf
A cold storage door serving forklift and pallet traffic often needs a clear opening of 2.5 metres or more. Building that opening as a single-leaf door is physically possible up to about 3,500 mm, but the economics and engineering favour double-leaf design at any width above 2,400 mm:
Door weight is manageable. A 3-metre single-leaf door with 120 mm PUF insulation weighs approximately 180-220 kg — heavy enough to require reinforced tracks and specialty bearings, and hard on any operator opening it manually. Two 1.5-metre leaves weigh 90-110 kg each — comfortable for manual operation and standard hardware.
Storage envelope is smaller. When a single-leaf door slides open, the panel needs unobstructed wall space equal to the door width — plus additional clearance. A 3-metre single-leaf door needs 3+ metres of clear wall to the side. A double-leaf door needs only 1.5 metres of clear wall on each side. Facility layouts that couldn’t accommodate a wide single-leaf door often work with double-leaf.
Operating force per operator is lower. Wide single-leaf doors require significant force to open — either operator strain or higher-cost motor drives. Double-leaf doors are opened by two operators (or automated with two smaller motors) with lower force each.
Central meeting seal doesn’t compromise hermetic sealing. Correctly-engineered meeting-point seals produce sealing performance equivalent to single-leaf doors of the same construction quality — the same 45° geometry, same four-side gasket, plus an additional vertical compression seal at the centre where the leaves meet.
Aluminium extrusion track — dual profile for opposing motion
Every double leaf sliding door for cold storage uses an aluminium extrusion overhead track engineered specifically for two-panel opposing-direction operation. The track profile has two indentation zones — one that guides the left leaf closing rightward, and one that guides the right leaf closing leftward. Both leaves execute the same 3D closing movement (horizontal, downward, inward) simultaneously, compressing gaskets against the frame and against each other at the central meeting point.
The track material and construction match our single-leaf products — high-quality aluminium extrusion with:
- Zero corrosion in cold, humid environments — 20+ year service life
- Precision profile from extrusion tolerances — consistent seal engagement across both leaves
- Low friction — smooth operation with less operator effort
- Structural capacity for two door panels supported simultaneously
Meeting-point seal — the critical engineering detail
The one design element unique to double-leaf sliding doors is the seal at the centre where the two leaves meet when closed. This is where cheaper double-leaf doors fail — they use a simple butt joint that develops gaps as the doors settle over years of operation, or they use a soft flexible seal that compresses too easily and doesn’t hold pressure differentials.
Our meeting-point seal uses a specific profile designed for continuous compression duty:
- Overlap geometry — one leaf has a projecting profile, the other has a matching recess; they interlock when closed
- Dual-lip gasket — primary seal on the projecting profile, secondary seal in the recess
- Compression stop — mechanical stop prevents over-compression that would deform the gasket over time
- Alignment adjustment — installer can adjust meeting alignment during commissioning if the opening is slightly out of square
Result: meeting-point sealing that performs like a continuous frame seal, not a compromise joint.
Same variants as single-leaf — chiller, freezer, blast freezer
Our double leaf sliding door for cold storage is available in the same three temperature variants as the single-leaf product line:
- Chiller room — for +0°C to +8°C applications, 80-100 mm PUF insulation, standard EPDM gasket
- Freezer room — for -18°C to -25°C applications, 120-150 mm PUF insulation, low-temperature EPDM gasket
- Blast freezer — for -30°C to -40°C applications, 150+ mm PUF insulation, specialised gasket materials, optional heated seal frame
Insulation thickness applies to both leaves; gasket material applies to frame seals, meeting-point seals, and sill seals throughout.
Manual, automatic, or semi-automatic operation
Standard configuration is manual — two operators (one per leaf) or one operator opening one leaf at a time. Suitable for moderate-traffic installations where the wider access is needed occasionally.
Semi-automatic operation adds a motor drive to one leaf while the other remains manual — appropriate for facilities where the primary leaf is opened frequently while the second leaf opens only for larger loads.
Fully automatic operation adds motor drives to both leaves with synchronised opening on proximity sensor or push-button activation — recommended for high-traffic corridors where operators cannot spare time to manually open two panels every cycle.
Built to run, season after season.
Wide openings 2,000-4,000+ mm
Standard opening widths from 2,000 mm to 4,000 mm accommodate forklift traffic, pallet-scale product movement, and large chamber access. Custom sizes available above 4,000 mm for the largest industrial cold storage applications.
Two-panel opposing closure
Two door panels close from opposite sides toward a central meeting point — halving the operating force per operator, requiring less wall clearance for the open position, and enabling wide openings that would be impractical as single-leaf doors.
Hermetic 45° seal geometry
Same 3D closing movement as single-leaf doors — both leaves slide horizontally, drop downward, and compress inward against the frame gaskets simultaneously. Industry-proven 45° seal geometry adapted for dual-leaf operation.
Precision meeting-point seal
Overlap geometry with dual-lip gasket at the central meeting point produces hermetic sealing where the leaves meet — engineered specifically for continuous compression duty. Alignment adjustment allows installer to correct minor opening out-of-square during commissioning.
Dual-profile aluminium track
Aluminium extrusion track with two indentation zones — one for each leaf's closing sequence. Same corrosion-resistant, precision-profile construction as our single-leaf product line, engineered specifically for two-panel opposing-direction operation.
Chiller, freezer, blast freezer variants
Available across the full cold storage temperature range with matching insulation thickness and gasket materials. Chiller (80-100 mm PUF), freezer (120-150 mm PUF), and blast freezer (150+ mm PUF with specialised gasket) configurations.
Manual, semi-automatic, or fully automatic
Standard manual operation for moderate traffic. Semi-automatic drives one leaf with motor while other remains manual — cost-effective for facilities where only occasional wide access is needed. Fully automatic operation synchronises both leaves for high-cycle traffic.
Manageable door weight
Two 1.5-metre leaves weigh 90-110 kg each — comfortable for manual operation and standard hardware. Contrast with an equivalent single-leaf door of 180-220 kg requiring reinforced tracks, specialty bearings, and significant operator force.
20-year service life
Same long-service-life design as single-leaf products — aluminium track resists corrosion, PUF-insulated panels remain dimensionally stable, EPDM gaskets maintain sealing performance for 10+ years before replacement. Doors that still seal properly 20 years after installation.
Chiller Room Double-Leaf
Configured for chiller room applications operating at 0°C to +8°C. Standard PUF insulation thickness (80-100 mm), standard EPDM gasket, standard aluminium track. Most common configuration for commercial cold storage warehouses with forklift traffic.
Specifications
| Type | Double-leaf sliding door with 45° hermetic seal |
|---|---|
| Opening widths | 2,000 mm to 4,000+ mm (larger on request) |
| Opening heights | 2,000 mm to 4,000 mm typical |
| Panel construction | PUF-insulated with steel skin, per leaf |
| Panel thickness | 80 mm to 150 mm (temperature dependent) |
| Track material | Aluminium extrusion, dual-profile |
| Track profile | Two indentation zones for opposing closure |
| Frame gasket | EPDM rubber, four-side |
| Meeting-point seal | Overlap geometry with dual-lip gasket |
| Operating temperature | -40°C to +8°C (variant dependent) |
| Panel skin | Pre-painted galvanised steel |
| Interior finish | Food-grade (stainless steel option) |
| Operation — manual | Standard, two-operator or single-operator sequential |
| Operation — semi-automatic | One leaf motor-driven, other manual |
| Operation — automatic | Both leaves motor-driven with synchronisation |
| Rollers | Precision bearings, stainless steel |
| Insulation | Polyurethane foam (PUF) |
| Service life | 20+ years typical |
| Custom sizes | Available on request above 4,000 mm |
Where it's used.
- Cold storage warehouses
- Forklift traffic corridors
- Large chamber access
- Chiller rooms (0°C to +8°C)
- Freezer rooms (-18°C to -25°C)
- Blast freezer applications
- Food processing facilities
- Meat & poultry processing plants
- Dairy processing plants
- Distribution & cross-dock facilities
Product questions, answered.
When should I choose double-leaf over single-leaf sliding doors?
The transition point is around 2,400 mm opening width. Below that, single-leaf sliding doors are simpler and cheaper. Above that, double-leaf doors offer three advantages: manageable door weight for manual operation, less wall clearance needed for the open position, and lower operating force per operator. Openings above 3,500 mm essentially require double-leaf construction — single-leaf doors that wide become impractical to operate and maintain.
Does the meeting-point seal really work as well as a continuous frame seal?
With correctly-engineered meeting-point geometry, yes. Our design uses an overlap profile — one leaf has a projecting profile that interlocks with a recessed profile on the other leaf. Dual-lip gaskets provide primary and secondary sealing at the meeting point, and mechanical stops prevent over-compression that would deform gaskets over time. Field measurements on installed doors show meeting-point sealing performance within 5-10% of continuous frame seals, well within acceptable range for cold storage applications.
How do double-leaf doors handle out-of-square openings?
Aluminium track and meeting-point seals both include alignment adjustment during commissioning. If the opening is slightly out of square (common in older buildings and site-erected cold rooms), our installer adjusts leaf position and meeting-point alignment to compensate. Adjustment range is typically ±10 mm on all axes. For significantly out-of-square openings, we can pre-machine the door frame to compensate before installation.
Do both leaves need automation, or can I automate just one?
Semi-automatic operation with one motorised leaf and one manual leaf is a valid option for facilities where the primary leaf is opened frequently for pedestrian and small-load traffic, while the secondary leaf opens only occasionally for large loads. The manual leaf is typically the wider of the two or the one furthest from the operator station. Semi-automatic reduces capital cost while providing hands-free operation for the majority of cycles.
What's the largest opening you can supply?
Standard product range covers 2,000 mm to 4,000 mm opening widths. Custom sizes are available up to approximately 6,000 mm — beyond that, structural considerations for the overhead track and mechanical considerations for door weight typically favour four-leaf configurations or high-speed rolling doors. Discuss requirements above 4,000 mm during specification for engineering assessment.
Can I retrofit double-leaf doors to existing single-leaf openings?
Only if the existing opening is wide enough for double-leaf configuration — typically 2,400 mm minimum. If your existing single-leaf door is smaller than that, retrofit isn't practical. If existing opening is wider, we can convert it to double-leaf during a scheduled shutdown. Retrofit scope: remove existing single-leaf assembly, install new dual-profile track, install both leaves, commission and adjust seals. Typical timeline: 2-3 days per opening.
How much cold air loss does the meeting-point seal add compared to single-leaf?
Negligible in properly-engineered double-leaf doors. Field measurements consistently show that meeting-point sealing adds less than 5% to overall door air loss compared to equivalent single-leaf construction. In other words, the small increase in seal linear length (the added meeting point) is offset by better overall seal quality that wider single-leaf doors typically cannot achieve.
What's the typical delivery and installation timeline?
Standard sizes ship in 5-7 weeks from order confirmation. Custom sizes and blast freezer variants run 7-9 weeks. Automatic variants add 1-2 weeks for motor drive assembly and synchronisation testing. Installation typically takes 2-3 days per door for mechanical work plus 1-2 days for automatic variants. Total project timeline from order to operational: 7-10 weeks for standard, 10-12 weeks for custom or premium configurations.
Every Prime Coil double leaf sliding door for cold storage is engineered against your specific opening dimensions and operating conditions — the meeting-point seal, track profile, and leaf balance all customised to your facility. Send us your specifications and we come back with the right model, delivered price, and installation timeline within one working day.
Capacities & model codes
Chiller Room Double-Leaf
Configured for chiller room applications operating at 0°C to +8°C. Standard PUF insulation thickness (80-100 mm), standard EPDM gasket, standard aluminium track. Most common configuration for commercial cold storage warehouses with forklift traffic.
- Chiller room duty (0°C to +8°C)
- PUF insulation 80-100 mm per leaf
- Standard EPDM gasket throughout
- Meeting-point overlap seal with dual-lip gasket
- Manual operation standard
Freezer Room Double-Leaf
Configured for freezer room applications operating at -18°C to -25°C. Increased PUF insulation thickness (120-150 mm), low-temperature EPDM gaskets throughout, cold-rated track bearings. Standard for large freezer facilities.
- Freezer room duty (-18°C to -25°C)
- PUF insulation 120-150 mm per leaf
- Low-temperature EPDM gaskets
- Cold-rated track bearings
- Anti-freeze provisions on all seals
Blast Freezer Double-Leaf
Heavy-duty configuration for blast freezer chamber access at -30°C to -40°C. Maximum PUF insulation thickness, specialised low-temperature gasket materials, optional heated seal frame on both leaves and meeting point to prevent freeze-stick during high-cycle operation.
- Blast freezer duty (down to -40°C)
- Maximum PUF insulation per leaf
- Specialised low-temperature gasket materials
- Heated seal frame optional (both leaves + centre)
- Heavy-duty track and bearings throughout
Automatic Double-Leaf
Fully automatic operation with synchronised motor drives on both leaves. Proximity sensor or push-button activation opens both leaves simultaneously; safety edge protection prevents pinch injuries. Available across all three temperature configurations.
- Two synchronised motor drives
- Proximity sensor or push-button activation
- Safety edge protection on both leaves
- Available across all temperature variants
- Recommended for 100+ cycles/day traffic
Tell us your daily requirement.
Share your output target, product and ambient conditions — we'll specify the machine and the plant around it.