Gas-tight insulated door for controlled atmosphere fruit and produce storage, where the modified gas mix must not leak.
A controlled atmosphere room slows ripening by holding a precise low-oxygen, high-carbon-dioxide mix around the fruit. That mix is expensive to generate and easy to lose — so the door must be as gas-tight as it is insulated. This door seals the atmosphere in, holds the temperature steady, and equalizes pressure safely, built to your opening from prototype to full production runs.
One idea: a normal cold room door keeps heat out, but a CA door must also keep a carefully engineered gas mix in. Any leak lets oxygen back in, restarts ripening and wastes the cost of running the CA generator.
Controlled atmosphere storage extends the shelf life of apples, pears and other produce by lowering oxygen and raising carbon dioxide around the fruit, which dramatically slows respiration and ripening. The whole room is a sealed envelope, and the door is its largest movable joint. If that joint leaks, the room cannot hold its target atmosphere and the generator runs constantly to compensate.
RAX builds the CA door with a continuous compressible gasket designed for gas-tightness, an insulated PU panel to hold the chilled temperature, and provision for a pressure-equalization device so the door is not loaded by the small pressure swings that CA rooms experience as temperature and gas levels change. Airtightness target, panel thickness and the final thermal figure are confirmed on your specification, and every unit is made to order from a single door, in any size and any RAL colour.
CA storage gas levels and temperature bands are industry-typical ranges for fruit storage; RAX confirms the airtightness target and rating for your room per project. The U-value is stated as a “down to” marketing reference for the insulated panel, not a tested door-set figure. RAX products are validated from −30 °C cold storage to +50 °C desert conditions.
Every door is engineered to your opening and your room. The values below are the validated baseline; final figures are confirmed on your specification. Each row states whether the value is RAX-measured, industry-typical or set per project.
| Parameter | Specification | Basis |
|---|---|---|
| Door Type | Insulated, gas-tight controlled atmosphere (CA) door for modified-atmosphere produce storage. | Product definition |
| Sealing | Continuous compressible gas-tight silicone perimeter gasket; cam-action hardware draws the leaf onto the seal. | RAX build |
| Airtightness Target | Engineered to the room’s leak-rate / half-life target for the CA gas mix — confirmed per project. | Per project |
| Atmosphere Range | Compatible with low-O₂ / elevated-CO₂ fruit storage (commonly O₂ around 1–5 %); set by your CA system. | Industry-typical |
| Pressure Equalization | Provision for a pressure-relief / equalization device so gas and temperature swings do not load the seal. | RAX option |
| Insulation Core | High-density PU foam panel, 100 / 150 / 200 mm selected to match the chilled room temperature. | Per project |
| Temperature Band | Chilled produce storage, typically 0 to +5 °C (fruit-dependent). | Industry-typical |
| Thermal Performance | U-value down to 0.33 W/m²K for the insulated panel construction (marketing reference, not a door-set test). | Marketing value |
| Cycle Life | 100,000 cycles validated in the RAX 100,000-cycle fatigue test lab. | RAX-measured |
| Panel Skins | Galvanized steel sheet (0.4–1.5 mm); stainless steel 304/316 available for hygienic rooms. | RAX build |
| Frame | Aluminum alloy profile 6063-T5; thermal-break detail to limit cold bridging. | RAX build |
| Safety | Internal safety release, airtight vision window (clear PVC / polycarbonate) for safe room inspection. | RAX build |
| Operating Range | Validated from −30 °C cold storage to +50 °C desert conditions. | RAX-tested |
| Fire Rating | EI60 / EI120 available — engineered and tested per project. | Per project |
| Max Opening | Custom to your opening — confirm on technical layout. | Per project |
Need an airtightness, U-value or fire figure certified for tender? We arrange third-party test data against the matching standard per project — see Compliance below.
Validated substrates, processed in-house on an auto PU foam panel line and CNC punching/bending centre. The gasket and closing hardware are specified for gas-tightness, not just insulation.
Long-term produce storage where the atmosphere is as important as the temperature.
Your installers get the full document set before the door ships — including the sealing detail your CA integrator needs to sign off.
Certificates we hold today, and the project-specific test data we arrange against the matching standard. We state held vs. per-project so you can tender honestly.
Rigorous 100,000-cycle fatigue testing, validated galvanized steel and aluminum alloy materials, and precision manufacturing — performed in-house, not outsourced.
Large industrial doors from prototype to container-load delivery. Start with an OEM sample and scale to container-load branded production.
Every CA door is built to your opening and your room. Send the clear opening size, the target atmosphere and airtightness requirement, the chilled temperature band and whether you need a pressure-equalization device (or site photos) and our engineers return a proposal, technical confirmation and lead time.
From custom engineering to container-load delivery — the document set your local installers need.
Warranty: door body 2 years · operator/motor 3 years · servo motor 5 years. Free spare parts within warranty (DHL/FedEx 5–7 days). Lead time: sample 7–15 days · standard container 12–20 days · custom first order 20–35 days.
A normal cold room door mainly keeps heat out. A CA door must also keep a precise low-oxygen, high-carbon-dioxide gas mix in, because that mix is what slows ripening. So a CA door is built around a continuous gas-tight gasket and multi-point cam hardware that compresses the seal evenly all round, not just an insulating panel.
Airtightness is set by your room’s leak-rate or half-life target, which depends on the CA system and the crop. We engineer the gasket and closing gear to that target and confirm it per project on the technical layout. If you need a certified airtightness figure for tender, we arrange third-party test data against the matching standard.
CA rooms experience small pressure swings as temperature changes and as the nitrogen generator or oxygen scrubber runs. Without a pressure-relief or equalization device, those swings push and pull on the door leaf, stressing the gasket and creating leaks. We provide for a pressure-equalization device so the seal is not loaded by these normal room-pressure changes.
Yes. The door carries a 100, 150 or 200 mm high-density PU foam panel matched to the chilled room temperature (typically 0–5 °C for fruit), so it holds both the atmosphere and the temperature. The U-value is stated as a “down to” marketing reference for the panel; RAX confirms the thermal performance for your room per project.
RAX holds ISO 9001:2015, CE marking against EN 13241 (industrial door product standard) and EN 12453 (operator safety), plus SGS material reports and Product Liability Insurance. Fire rating (EI60/EI120) and AS/NZS 4505 / UL counterpart test data are arranged per project, not held as standing certificates.
Yes. Every door is engineered to your clear opening, fully custom-engineered to your opening in any RAL colour. Full OEM/ODM is supported — private label, packaging printing and manual translation (EN/ES/FR/AR/RU) — under strict NDA.
Sample orders run 7–15 days, a standard container 12–20 days, and a custom first order 20–35 days (repeat custom orders 15–20 days). FOB ports are Tianjin and Qingdao; FCL and LCL are both supported. The door body is warranted for 2 years and the operator/motor for 3 years (servo motor 5 years), with free spare parts shipped by DHL/FedEx within warranty.
Every order includes installation guides showing the gas-tight sealing detail, an English installation manual, FAI first-article confirmation and pre-assembly photos, a factory inspection report (insulation resistance, noise, visual and function tests), the 100,000-cycle fatigue test video/report, and the CE Declaration of Conformity with the EN 13241 test report.
Send your opening size (W × H), target atmosphere and airtightness requirement, and chilled temperature band. Our engineers reply with a proposal and lead time — no obligation.
