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عربىTechnical Parameters for Corridors and Mezzanines
Corridors are classified by what they carry and what they connect. The class, width and pressure depend on your layout, your guideline and your risk assessment. The table gives common references.
| Space | Purpose | Typical class and features |
|---|---|---|
| Clean corridor (personnel) | Connects gowned areas | Often ISO 7 or ISO 8; positive or intermediate pressure |
| Material corridor | Moves materials and waste | Often ISO 8; separate from personnel where possible |
| Dirty or return corridor | Returns waste and used materials | Lower grade, pressure lower than rooms it serves |
| Technical or service corridor | Gives access to services behind rooms | Often unclassified; sealed from the clean side |
| Technical mezzanine (interstitial floor) | Houses AHUs, ducts, pipes and cables above the rooms | Separate floor; slab or steel deck; access by stairs or lift |
| Walkable ceiling | Light access from above | Panels and grid designed for foot traffic |
Design points:
- Width: corridors for people alone can be about 1.5 m wide, while corridors for carts and pallets are often 2 to 3 m or more.
- Pressure pattern: rooms may sit at higher or lower pressure than the corridor, depending on the risk of the process.
- Impact protection: rails and corner guards protect walls and doors from trolley damage.
- Doors: wide flush or sliding doors, with vision panels and interlocks where needed.
- Mezzanine loads: floor loads for AHUs and equipment are set by the structural engineer, and the cleanroom ceiling should not be used to carry them unless designed for it.
- Fire safety: escape routes and compartments must follow local rules.
Please also tell us the largest item that must pass through the corridors and doors, and the weight of equipment planned on the mezzanine. These two numbers decide door size, frame strength and the structure needed.
Cross-Border Delivery and Localized Construction Support
Corridors and technical spaces involve many trades at once: structure, HVAC, electrical, plumbing, fire protection and cleanroom construction. We plan shipments around the building schedule and the order of trades, so panels are not stored for long and are not damaged by other work.
- Layout and flow review: we confirm corridor widths, door positions, mezzanine access and service routes.
- Drawings: wall, ceiling, door, window and hatch details are agreed before production.
- Production and numbering: panels, grids, doors and profiles are produced and labeled by position.
- Packing and shipping: flat-pack loading with protection, and documents with FOB, CFR or CIF terms.
- Installation support: manuals, video guidance or a supervising engineer.
Local construction: a typical sequence is to finish structure, mezzanine floor and major services, then erect cleanroom walls and ceilings. Penetrations from the mezzanine into the rooms, such as ducts and cables, should be planned with sleeves and sealed carefully, because each one is a possible leak. Wide corridors for carts need level floors and strong frames.
Local building, fire and safety rules apply, especially for stairs, handrails and work at height, and your engineer or contractor remains responsible for approvals.
For large plants, we suggest a coordination meeting between the structural engineer, HVAC designer, contractor and our engineer. Agreeing mezzanine openings, duct sleeves, hatch positions and door sizes on one drawing prevents most site conflicts. Staged shipments can also be arranged when the building is handed over in phases.
Our staff reply promptly and in plain language, and our designers can adapt standard layouts to your building and your process.
Quality Control and Certification
Corridors and mezzanines are inspected for geometry, fire safety, pressure and cleanliness. No panel is "mezzanine certified", and we do not claim this. We control what we make and provide records for your files.
| Control step | Inspection | Why it matters |
|---|---|---|
| Incoming materials | Sheet, face, core, profiles, gaskets, glass | Known quality |
| Panel production | Dimensions, flatness, bonding, edge sealing | Tight, straight walls |
| Door check | Frame, leaf, gasket contact, hardware | Durable operation |
| Walkable panel check | Core fill, face thickness, grid joints | Strength for foot traffic |
| Surface inspection | Scratches, bubbles, color, cleanability | Easy cleaning |
| Packing | Count, labels, edge protection | Undamaged delivery |
Documents available: material specifications, factory inspection records and, where available, reports on fire performance or load tests for walkable panels.
Please tell us the fire class, load and any code you follow. We will confirm what documents exist and avoid promising anything that does not. Customer audits of our factory and sample approvals are welcome.
Consultants and authorities often ask for fire and load documents for corridors and walkable ceilings. We share the reports that exist, explain the panel build, and welcome factory visits or live video tours, where you can watch panels, doors and grids being made and inspected. Batch records are kept for each project, so later questions about a specific area can be traced to production.
We recommend agreeing the required fire class and load before the order.
Our staff reply promptly and in plain language, and our designers can adapt standard layouts to your building and your process.
After-Sales Service and Response Capability
Corridors take the heaviest traffic in any plant. Carts hit walls, pallets scrape doors and technicians open hatches daily. Our after-sales service focuses on quick repair of impact damage and wear, using records of what was installed.
- Fast communication: technical questions answered in English by email, phone or messaging.
- Remote diagnosis: photos or videos of damaged walls, doors and hatches help us assess problems.
- Spare parts: panels, door leaves, hinges, gaskets, protective rails, windows and ceiling parts.
- Modification support: new openings, doors or hatches can be added with updated drawings.
- Engineer visits: by arrangement.
Typical problems:
| Location | Typical issue | Suggested action |
|---|---|---|
| Wall bases and corners | Impact from carts | Fit protective rails, repair panel |
| Door edges | Pallet damage, gasket wear | Repair or replace door parts |
| Ceiling hatches | Loose fixings, worn gaskets | Tighten, replace gasket |
| Mezzanine penetrations | New cables added without sealing | Reseal with suitable material |
We suggest weekly walk-throughs by supervisors and a monthly check by maintenance. Keeping a few spare panels and protective rails on site saves time.
Corridor damage is usually caused by carts, pallets and equipment moves, so prevention is the best repair. We suggest checking wall bases, corners and door edges weekly, and adding rails where damage repeats. Sending us photos with the area name lets our engineers compare them with the project drawings.
Replacement panels and parts are made to the original specification, so color and sealing match the existing system. For urgent cases, we discuss the fastest shipping option and prepare documents in advance.
A few spare panels, rails and gaskets at the site help you act the same day.
Commercial Terms, Warranty and Lifecycle Cost
Corridors cover a large area, so unit price matters, but they also take the most abuse. Protection against impact and a durable face often cost less than repeated repair. A balanced specification usually gives the best value.
| Item | Our approach |
|---|---|
| Quotation | Itemized by area and component group, with drawings |
| Trade terms | FOB, CFR or CIF, defined in the quotation |
| Payment | Commonly a deposit with balance before shipment or against documents; final terms in the contract |
| Warranty | Defined by component group in the contract |
| Lead time | Given after drawing confirmation |
| Customization | Panel type, thickness, door width, rails, windows, hatches |
Where cost is decided:
- Face material: HPL and stainless last longer under heavy traffic than painted steel.
- Impact protection: rails and guards cost little compared with repair.
- Door count and size: wide doors and sliding doors cost more.
- Mezzanine access: walkable ceilings or hatches are cheaper than a full mezzanine, if loads are light.
Mezzanine steel structure, floors, stairs, handrails, HVAC, services and permits are outside our supply unless agreed. Warranty exclusions are stated clearly in the contract.
When comparing quotations, ask each supplier to state panel face, thickness, door width, impact protection, ceiling type and packing, not only price per square meter. Small differences in these items decide how long the corridors stay in good condition.
We provide itemized quotations and can show alternatives, such as HPL faces in busy corridors and standard faces in light-traffic areas.
We are glad to explain every line of the quotation.
Our staff reply promptly and in plain language, and our designers can adapt standard layouts to your building and your process.
Real Factory Strength for Corridor and Mezzanine Projects
Large plants need steady supply across many rooms. Pharma United Co., Ltd., founded in 2006, runs two factories in Kunshan and Qianjiang covering 20,000 m², with more than 60 staff. We are a manufacturer, not a trading company.
| Indicator | Information |
|---|---|
| Experience | 20+ years in cleanroom engineering |
| HPL cleanroom panels | About 250,000 m² per year; China's largest HPL cleanroom panel manufacturer |
| Container shipments | More than 1,000 forty-foot high-cube containers per year |
| Location | Kunshan, about 30 km from Shanghai |
| Product range | Panels, doors and windows, equipment, modular PODs, HEPA products |
| Service | Design, manufacture and installation support |
Why this helps buyers of large plants: large panel output supports long corridors and many rooms with uniform finish and color. Because panels, doors, windows and ceiling systems come from one source, interfaces match and the whole plant looks and performs as one system.
Samples, references, factory visits and video tours are available on request. Our engineers answer technical questions directly.
Our designers prepare layouts and detail drawings, our engineers review loads and interface details, and our production teams run dedicated lines for panels, doors, grids and equipment. Export coordinators prepare packing and documents for shipments to many countries.
Customers in pharmaceutical, hospital and electronics fields return for new corridors, extensions and spare parts, and we can share photos and videos of completed plants on request. Visitors are welcome at our factory by arrangement.
Our staff reply promptly and in plain language, and our designers can adapt standard layouts to your building and your process.
Cleanroom Corridor & Technical Mezzanine FAQ
Q1. How wide should a cleanroom corridor be?
About 1.5 m for people only, and 2 to 3 m or more where carts and pallets pass. Your layout and fire rules decide.
Q2. What is a technical mezzanine?
An extra floor above or beside the cleanrooms that holds air handlers, ducts, pipes and cables, so that service work is done outside the clean rooms.
Q3. Is a walkable ceiling the same as a mezzanine?
No. A walkable ceiling gives light access above the room, while a mezzanine is a full structural floor that can carry heavy equipment.
Q4. Can the cleanroom ceiling carry the AHUs?
No. Heavy equipment should be carried by the building structure or a mezzanine floor, not by ceiling panels.
Q5. Should the corridor be positive or negative?
It depends on the process. Many plants place the corridor between rooms, and your pressure plan decides.
Q6. Do you supply the mezzanine structure?
No. Structural steel and floors come from structural contractors, and we coordinate the interfaces.
Q7. How do I get a quotation?
Send your layout, corridor and door sizes, mezzanine plan and destination country.
Q8. Can corridor walls be protected from carts?
Yes. Rails, corner guards and tougher faces reduce damage, and we can add them to the order.
Q9. Do you offer samples?
Yes, samples of panels and doors can be sent for approval.
Q10. Can you help with layout?
Yes, we prepare layout proposals that your team can adjust.
Our staff reply promptly and in plain language, and our designers can adapt standard layouts to your building and your process.
