Every Opening is an Air-Management Component — Not Just a Barrier
In a cleanroom, a door is not simply a physical barrier that permits or prevents entry. Every time a door opens, the pressure differential between adjacent ISO-classified zones is exposed to a direct air pathway. The quality of the door’s sealing, closing speed, hardware configuration, and interlocking logic determines whether the facility’s contamination control strategy survives that access event.
🔌 Why Cleanroom Doors Require Engineering-Grade Specifications
Standard commercial doors — even fire-rated or acoustic doors — are designed to stop smoke, sound, or heat. They are not designed to maintain the 10–15 Pa differential pressure that pharmaceutical cleanroom zones operate at. A standard door with a 1mm gap at the bottom creates an air leakage path that allows the pressure differential to equalise within seconds of closing, making contamination control reliant on the HVAC system constantly re-establishing pressure rather than the door seal maintaining it.
A Metrolabs cleanroom door is a high-performance air-management component designed to withstand constant pressure differentials and high-frequency use. Recessed hinges and handles eliminate external dust-collecting protrusions. The concealed drop seal activates automatically on closing — no floor threshold, zero trip hazard. The gasket compresses against the frame on all four sides simultaneously. The result is a door that actively contributes to contamination control.
Four Requirements Every Metrolabs Door & Window Meets
Zero-Ledge — Flush with Wall Panel on Both Sides
Every Metrolabs door and window sits perfectly flush with the cleanroom wall panel face on both sides — no external frame protrusion, no step at the wall-to-frame junction, no horizontal ledge at the top of the frame where dust settles between cleaning cycles. The flush profile is not a cosmetic choice — it is the Zero-Ledge contamination control principle applied to every structural opening.
Four-Sided Hermetic Sealing — Head, Jambs, and Threshold
All Metrolabs doors use medical-grade silicone or EPDM gaskets at all four door edges simultaneously. When the door closes and latches, all four gaskets compress to the specified sealing force in a single motion — creating a hermetic seal at every point of door-to-frame contact, with zero reliance on the operator’s closing technique or the door’s settlement position.
VHP & Full GMP Disinfectant Compatibility
All door finishes (SS 304/316L), gasket materials (silicone or EPDM), glazing sealants, and hardware coatings are tested and rated for Vaporised Hydrogen Peroxide at 1000 ppm — the highest pharmaceutical decontamination concentration. No surface degradation, gasket swelling, or hardware corrosion occurs during room VHP decontamination cycles. No door disassembly or protection required.
Factory Air-Leakage Tested — IQ Documentation Supplied
Every Metrolabs door unit is factory-tested for air-leakage rate at design differential pressure before dispatch — confirming the gasket compression maintains the specified leakage rate. The factory test report is supplied in the IQ documentation package, allowing the door to be included in the facility’s pressure decay test qualification without a separate site test, reducing validation timeline and cost.
Six Specialised Opening Systems for Every Cleanroom Access Requirement
A complete range of cleanroom doors and windows engineered for pressure stability, contamination control, and long-term GMP performance:
For BSL-3 labs, Grade A/B pharmaceutical suites, and any environment requiring absolute atmospheric control — 4-sided compression sealing with zero air leakage even under high differential pressures.
- 4-Sided Sealing: Unique track system moves door inward and downward on closing — compresses gasket against frame and floor simultaneously on all four edges
- Airtight Compression: High-durability silicone gasket — zero air leakage under high differential pressure, independent of operator closing technique
- SS 304/316L Body: Full pharmaceutical disinfectant and VHP 1000 ppm compatibility throughout
- Recessed Hardware: No external protrusions — handles and hinges fully recessed into door and frame
The workhorse of the sterile facility — engineered for high-frequency daily use with long-term gasket, hardware, and drop seal performance. Flush mounting, automatic drop seal, concealed hinges, SS kick plates.
- Flush Mounting: Sits perfectly level with wall panel both sides — zero particle-accumulation protrusion at frame perimeter
- Auto Drop Seal: Concealed mechanical drop seal activates on close — zero floor threshold, zero trip hazard — no manual activation
- 500,000+ Cycle Rating: Hardware, gasket, and drop seal mechanism rated for 500K+ open-close cycles without replacement
- SS 316L Kick Plates: 400mm kick plates both faces — protects door skin at trolley and equipment cart impact height
Double-skinned SS 304 or SS 316L with high-density infill for simultaneous thermal and acoustic insulation — for zones requiring both pressure integrity and temperature or sound management.
- EPDM Gasketing: Non-shedding EPDM gaskets recessed into door leaf — maintains consistent seal over full service life without particle generation
- Double-Skinned SS: SS 304 or SS 316L both inner and outer skin — PUF, Rockwool, or Honeycomb infill per thermal and fire requirements
- Seamless Corners: All corners interlocked and ground smooth — no snag points for cleanroom garment fabric
- Thermal Break: PUF or Rockwool infill prevents condensation on door skin across temperature differential zones
Visibility for safety and monitoring without compromising sterility — double-glazed toughened safety glass mounted flush with wall or door surface, de-humidified cavity prevents condensation at any temperature zone.
- Flush Zero-Ledge: Double-glazed glass flush with panel surface — continuous, easy-to-clean vertical plane, no frame step
- De-Humidified Chamber: Desiccant-filled internal cavity — clear visibility across temperature differentials including cold room-to-ambient interfaces
- 5–6mm Toughened Safety Glass: Personnel safety-rated — does not shatter into cutting shards on impact
- Pharma Silicone Seal: Glass-to-frame sealed with pharmaceutical-grade silicone — VHP 1000 ppm compatible
For airlocks and gowning corridors — EM-locked sequential logic ensures the dirty-side and clean-side doors can never be open simultaneously, preventing direct air exchange between different ISO class zones.
- Sequential EM Logic: Electromagnetic lock PCB — both doors cannot open simultaneously at any time — hardware-enforced, not SOP-dependent
- Red/Green LED: Status indicators on both sides — Green = available, Red = locked — clear visual confirmation for personnel
- Battery UPS Fail-Safe: Power loss defaults to both doors locked — pressure cascade maintained through power outage
- Emergency Override: Supervisor keyswitch with audible alarm and log record on activation
Efficient transfer of small materials without personnel movement — reducing contamination risk and maintaining zone pressure integrity with mechanical or electronic interlock and fully coved cleanable interior chamber.
- Mechanical/Electronic Interlock: Prevents direct air breach between rooms of different ISO class — sequential shutter access only on both sides
- Zero-Ledge Coved Interior: All internal chamber corners coved with radius profile — 100% wipe-down accessibility for full sterilisation
- SS 304/316L Frame: Flush-mounted into panel wall — zero-ledge exterior on both sides — VHP compatible
- UV-C Germicidal (Optional): UV-C lamp for idle-period chamber decontamination between material transfers
Three Key Systems — The Mechanism Behind Cleanroom Door Performance
Understanding what separates a pharmaceutical-grade cleanroom door from a standard commercial door:
Hermetically sealed doors use a unique track-and-compression mechanism fundamentally different from a standard door’s hinge-and-latch operation. A standard door swings on hinges and latches against a door stop — the latch holds the door closed, but the door-to-frame contact at the head and two jambs is defined by the door stop depth, which varies with manufacturing tolerances and building settlement. The gap between the door edge and the door stop face is therefore variable and unpredictable — and with any gap, air leakage occurs.
A hermetically sealed door uses a track system that moves the door in two sequential motions: first, it swings to the closed position in the plane of the door (like a standard door); then, the track system moves the door perpendicular to the door plane — pressing all four door edges against the gaskets simultaneously with a controlled, uniform compression force. This perpendicular compression motion is the key mechanism: it compresses the gasket by a specific, predictable amount regardless of dimensional tolerances — because the compression is driven by the track geometry, not by the latch force or door stop position.
🔒 Track Compression
Track moves door inward + downward — all 4 gaskets compress simultaneously to controlled force — settlement-resistant.
🔌 Medical Silicone Gasket
VHP 1000 ppm rated · IPA/QAC/PAA resistant · 500,000-cycle service life · Non-shedding.
⚖️ SS 304/316L Body
Double-skinned SS · PUF or Rockwool infill · Thermal and acoustic performance · Full GMP range.
📋 IQ Documentation
Factory air-leakage test at design ΔP before dispatch · Test report in IQ documentation at handover.
The cleanroom swing door is the highest-frequency-use item in any pharmaceutical or research facility — opened and closed hundreds of times per shift by personnel in cleanroom garments, impacted by trolleys and equipment carts, wiped down with IPA or disinfectant at every cleaning cycle. Its engineering must reflect this demanding use profile: hardware rated for 500,000+ cycles, gaskets that maintain compression over the full cycle life, and door skins that resist trolley impact without surface damage.
The automatic drop seal is the most critical engineering feature. A standard swing door with a gap at the floor creates an air leakage path that allows the room pressure differential to equalise — a door with a floor threshold eliminates the gap but creates a trip hazard at one of the highest-traffic points in the facility. The concealed mechanical drop seal solves both problems: it retracts into the door bottom when the door opens (zero floor threshold, zero trip hazard), and automatically extends to contact the floor when the door reaches the closed position — creating an airtight floor seal with no manual activation required.
The swing door is recommended to open into the higher-pressure room. The room’s air pressure acts on the full door face area, generating a passive sealing force proportional to the pressure differential and door area that supplements the latch force and enhances hermetic integrity. A 900mm x 2100mm door at +15 Pa generates approximately 28 Newtons of sealing force from room pressure alone — a continuous, physics-driven mechanism requiring no active component.
🔧 Auto Drop Seal
Concealed mechanical — retracts on open, extends on close. Zero threshold. Zero trip hazard. No manual operation.
🔌 500K+ Cycle Rating
Hardware, gaskets, drop seal rated for 500,000+ open-close cycles — full facility service life without replacement.
🚫 SS 316L Kick Plates
400mm height both faces — protects door skin at trolley and equipment cart impact zone throughout service.
🔳 Flush Zero-Ledge
No external frame protrusion — both sides flush with panel face — Zero-Ledge philosophy applied to every opening.
The interlocking door system is the engineering solution to the airlock contamination risk. An airlock works on the principle that personnel can only transit through one door at a time — so the pressure differential between the clean zone and the corridor is never simultaneously exposed on both sides of the airlock buffer room. But this principle only works if personnel actually comply with the one-door-at-a-time rule.
In practice, particularly during high-traffic shift changes, personnel sometimes prop one door open while waiting — and then open the other door — creating the exact through-path the airlock is designed to prevent. The electromagnetic interlocking system eliminates this human compliance factor entirely: the logic controller physically prevents Door B from opening while Door A is open, and vice versa. The sequential access rule is enforced by hardware — not by SOP compliance — making contamination control independent of personnel behaviour.
🔄 EM Sequential Lock
Logic PCB — Door B cannot open while Door A is open. Hardware-enforced — not SOP-dependent.
🌙 Red/Green LED
Status both sides — Green = available, Red = locked. Clear personnel communication at every access event.
🔋 Battery UPS
Power failure defaults to both doors locked — pressure cascade maintained through power outage events.
⚡ Emergency Override
Supervisor keyswitch — audible alarm + GMP deviation log record on every activation.
Metrolabs Opening Systems — Standard Technical Specification
| Feature | Metrolabs Opening Standard | Benefit |
|---|---|---|
| Door Material | SS 304 / SS 316L — double-skinned construction | Maximum chemical resistance · Full GMP disinfectant range |
| Door Infill | Paper Honeycomb / PUF / Rockwool — per application requirement | Thermal insulation · Acoustic performance · Fire resistance (Rockwool) |
| Gasket Material | Medical-grade silicone or EPDM — non-shedding recessed into leaf | VHP 1000 ppm rated · IPA/QAC/PAA rated · 500K+ cycle life |
| Hardware | Recessed handles & internal hinges throughout — no external protrusions | Zero dust-collecting ledges · Zero snag points for cleanroom garments |
| View Panel Glazing | 5mm–6mm toughened double-glazed safety glass — de-humidified cavity | Personnel safety · No cutting shards · Fog-free at any temperature zone |
| Threshold / Floor Seal | Concealed mechanical auto drop seal — zero floor threshold | Zero trip hazard · Airtight floor seal · Auto-activates on close — no manual operation |
| Interlock Logic | EM sequential PCB — battery UPS — Red/Green LED both sides | Fail-safe sequential access · Hardware-enforced · Power-outage safe |
| VHP Compatibility | All finishes, gaskets, and glazing sealants tested at 1000 ppm VHP | No disassembly during VHP cycles · Immediate return to service |
| Factory Testing | Air-leakage rate tested at design differential pressure before dispatch | IQ documentation ready at handover · GMP / ISO validation supported |
| Cycle Life | 500,000+ open-close cycles — hardware, gasket, drop seal, and glazing | Full facility service life without gasket or mechanism replacement |
Custom Configurations — Every Opening Matched to Your Facility SOPs
Metrolabs customises every opening to match your facility’s specific Standard Operating Procedures:
Sliding Cleanroom Doors — Manual & Auto Sensor
Ideal for areas with limited floor space or for large equipment entry zones where a door swing arc would obstruct the process area. The sensor-driven variant triggers on personnel presence without physical contact — hands-free, reducing contamination transfer at high-traffic access points. Available with hermetic sealing at the closed position using a lateral compression gasket system, maintaining the Zero-Ledge and airtight performance of the swing door range in a sliding configuration.
Enquire About Sliding Doors ↗Emergency Exit Doors — Panic Bar Cleanroom Design
Panic Bar hardware integrated into cleanroom-safe door design — the bar mechanism is concealed flush within the door leaf at the cleanroom-facing side, activated only by the specific horizontal push motion, preventing accidental activation during standard operation while allowing immediate single-handed egress in all cleanroom gowning and PPE conditions. The frame seal and gasket are restored when the door closes after emergency use — maintaining pressure integrity immediately after the egress event.
Enquire About Emergency Exit Doors ↗Fire-Rated Doors — 60 to 120 Minutes
Engineered to provide 60 to 120 minutes of fire protection while maintaining ISO-class sterility — Rockwool-core door infill with intumescent fire seals at the door perimeter that expand at fire temperatures, sealing the door gap completely against smoke and flame spread, without compromising the cleanroom gasket seal during normal operation. Available with FM-approved fire hardware and door closers. Fire rating and cleanroom performance are tested and certified simultaneously — not applied as separate systems.
Enquire About Fire-Rated Doors ↗Lead-Lined Systems — Radiopharmacy & Nuclear Medicine
For radiopharmaceutical laboratories requiring both particulate control and radiation shielding — lead-lined door panels and view panel frames providing the required shielding thickness (typically 1–3mm Pb equivalent for standard radiopharmacy applications) while maintaining the hermetic sealing, Zero-Ledge profile, and VHP compatibility of the standard cleanroom door range. The lead lining is fully encapsulated within the door body — no exposed lead on any cleanroom-facing surface. Available for hospital radiopharmacy, nuclear medicine preparation, and PET cyclotron facility applications.
Enquire About Lead-Lined Systems ↗Cleanroom Doors & Windows for Every Regulated Sector
Precision door and window systems for pharmaceutical, hospital, biotech, and research environments:
Pharmaceutical GMP
Hermetic sealed for Grade A/B aseptic suites. Interlocking airlocks for Grade B/C transition. Swing doors for Grade C/D corridors. Full GMP IQ documentation at handover.
Aseptic Manufacturing
Hermetic doors for filling room entry. Interlocking EM airlocks with Red/Green LED for Grade A/B buffer entry. Pass-through windows for vial and component transfer. VHP 1000 ppm throughout.
Hospital & OT Complex
NABH-compliant hermetic and swing doors for operating theatres, CSSD, and oncology suites. Rockwool fire-rated doors for hospital corridors. Lead-lined for radiopharmacy. Panic bars for emergency exit.
Biotech & BSL Labs
Hermetically sealed doors for BSL-2/3 containment suites. Sequential interlocking airlocks for BSL zone transitions. Emergency exits with cleanroom-safe panic bars. WHO LBM guideline compliant.
Semiconductor & Electronics
Swing and sliding doors for ISO Class 5–7 fabs. Sensor-driven auto doors for hands-free ESD-safe access. Double-glazed view panels for process zone monitoring without entry. ESD-grounded hardware.
Food & Beverage
FSSAI high-care zone swing doors with drop seals. SS 316L kick plates for food production trolley impact zones. Pass-through windows for material transfer between preparation and packing areas.
Research & NABL Labs
Air-tight doors with EPDM gasketing for analytical laboratories. Interlocking double-door airlocks for containment zone BSL transitions. Full NABL accreditation documentation package at handover.
Radiopharmacy
Lead-lined hermetic doors (1–3mm Pb) for radiopharmaceutical labs. VHP-compatible throughout. Hospital nuclear medicine, PET cyclotron, and AERB-regulated facility applications. Full lead encapsulation — no surface exposure.
The Fine Details of Cleanroom Architecture — Every Opening Engineered
A Metrolabs door or window is not just a barrier — it is an engineered solution for high-accuracy performance in the most demanding pharmaceutical and research environments:
VHP Compatibility — All Finishes & Gaskets Tested at 1000 ppm
All Metrolabs door and window finishes (SS 304/316L), gasket materials (silicone, EPDM), glazing sealants (pharmaceutical-grade silicone), and hardware coatings are tested to withstand VHP sterilisation at 1000 ppm without surface degradation, gasket swelling, or hardware corrosion — so no door disassembly, protection, or material removal is required before or during room VHP decontamination cycles.
Hardware Integration — Recessed Handles & Internal Hinges Throughout
Every Metrolabs cleanroom door uses recessed SS 316L pull handles (flush with the door face — no protruding handle knob or lever that could catch cleanroom garment fabric) and internal hinges (completely concealed within the door leaf and frame — no exposed hinge barrel on the cleanroom-facing surface creating a particle accumulation and cleaning obstruction point). This hardware approach is the Zero-Ledge philosophy applied to the door itself — every component that could collect dust or particles is removed from the cleanroom-facing surface.
Audit-Ready Quality — Factory Air-Leakage Tested Before Dispatch
Every Metrolabs door unit is factory-tested for air-leakage rate at the design differential pressure before dispatch. The test report is supplied in the IQ documentation package, allowing the door to be included in the facility’s GMP and ISO validation submission without requiring a separate door air-leakage test at site — reducing the validation timeline, reducing the cost of on-site qualification testing, and ensuring the door arrives at site with proven performance documentation rather than nominal specification claims.
Zero-Ledge Integration — Flush with Every Modular Panel System
Every Metrolabs door and window frame is manufactured to the exact dimensional specification of the modular cleanroom panel system it is installed into — the frame face is flush with the panel face on both sides of the wall, with no external frame protrusion. The junction between the door frame and the panel is sealed with pharmaceutical-grade silicone — continuous, inspectable at every cleaning cycle, and replaceable without disturbing the door or panel when the sealant reaches the end of its service life.
Factory & Office
4, SIDCO-MICRO, Thirumudivakkam,
Chennai – 600 132, Tamil Nadu
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Phone
Websites & GSTN
www.metrolabs.biz
www.schoollabfurniture.com
GSTN: 33AASFM3382K1ZT
Ready to Engineer Your Cleanroom Doors & Windows?
Contact Metrolabs for a free opening systems assessment. Our specialists will review your ISO class, access patterns, interlocking requirements, fire-rating, and compliance standards — then specify the right door and window system for every opening in your cleanroom.
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