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Design guides

Five decisions, in the order they should be made.

These five guides are written for the person who has to fix the specification, not for the person who has to sell it. Start with the decision order below.

1 U height · 2 width · 3 depth · 4 load class · 5 mesh ratio and finish

Route tree: five design guides, and the condition that sends you to each one What has to be fixed 01 Rack Selection space and load 42U = 2000 mm 02 Airflow & Cooling the room runs hot ≥75% / ≥60% 03 Cold Aisle Design the aisle has to close 2–3 weeks 04 Power & Grounding power and earth multi-point bonding 05 Seismic & Load a test result to defend CAICT report
Route tree, upper levels. Each row is one guide and the condition that sends you to it.

Reading order

Start at 01, and stop when your own decision is fixed.

  1. 01 Rack Selection

    42U or 47U, 600 or 800 wide, how deep, what load class.

    Bring your equipment list

    Open the guide
  2. 02 Airflow & Cooling

    Where the air goes, and why mixing costs money.

    Bring your room density

    Open the guide
  3. 03 Cold Aisle Design

    Door types, roof panels, how the aisle closes at the ends.

    Bring your row length

    Open the guide
  4. 04 Power & Grounding

    Bonding, PDU positions, the earthing path.

    Bring your distribution layout

    Open the guide
  5. 05 Seismic & Load

    What a load test and a seismic test actually measure.

    Bring your floor and zone requirements

    Open the guide

Route tree

The same tree, with the decision each branch settles.

The complete route tree: one starting question, five branches, and the key figure each guide settles START HERE What has to be fixed space and load 01 Rack Selection U height, width, depth, load class and mesh ratio 42U = 2000 mm the room runs hot 02 Airflow & Cooling cold aisle, hot aisle, blanking panels, mesh ratio ≥75% / ≥60% the aisle has to close 03 Cold Aisle Design door types, roof panels, how the aisle closes at the ends 2–3 weeks power and earth must be defined 04 Power & Grounding bonding, PDU positions, the earthing path multi-point bonding a test result has to be defended 05 Seismic & Load what a load test and a seismic test actually measure CAICT · 18 pages
Complete route tree. The highlighted branch is the default first read: branch 01 fixes the space and the load class that branches 02 to 05 all assume.

The five guides

What is inside each one.

A 42U floor-standing server rack, front door open at a shallow angle, rails and U slots visible

GUIDE 01

Rack Selection

Fix U height, width, depth, load class and mesh ratio — in that order.

  • U height budget
  • width and depth tables
  • load and mesh ratio

42U = 2000 mm / 47U = 2200 mm

Open the guide
Macro across a perforated rack front door, the perforation grid filling the frame

GUIDE 02

Airflow & Cooling

Cold air in the front, hot air out the back, and never let the two meet.

  • cold and hot aisle principles
  • blanking panels
  • mesh ratio

front ≥75% / rear ≥60%

Open the guide
A sealed cold aisle containment seen on the diagonal, glass end door and lit fascia at the row end

GUIDE 03

Cold Aisle Design

Close the aisle at the top and at both ends, and leave a way in for suppression.

  • door types
  • roof panels
  • roof panel operation

2–3 weeks · 3 to 8 cabinets

Open the guide
A dark floor-standing distribution cabinet, three-quarter view from the left, breaker rows stacked behind the open door

GUIDE 04

Power & Grounding

Bond the doors and the frame, and reserve the mounting positions before the row is fixed.

  • bonding points
  • reserved busbar and PDU mounting positions
  • earthing path

multi-point bonding

Open the guide

GUIDE 05

Seismic & Load

Static load and seismic performance are measured separately, and reported separately.

  • load test report page by page
  • seismic test report
  • what each test measures

CAICT seismic test report18 pages

Static load test report3 pages

Load, standard1,000 kg

Load, upper limit1,500 kg on reinforced-frame models

CAICT · 18 pages

Open the guide

Documents

Every figure in these guides ships with a document.

Nothing in the five guides is illustrated with a borrowed figure. Every number traces back to a document we can hand over: three third-party inspection reports reproduced sheet by sheet, the three management-system certificates, and the registration papers behind the trademark and the patents. The register says what each document covers and which guide quotes it.

  • CAICT

    Seismic test report — CAICT, 18 pages

    Third-party inspection report. All 22 sheets — the cover, the commission sheet, the statement and the contents, then the 18 numbered pages — are reproduced in full on the Seismic & Load guide, together with the English transcription of the four result tables.

    Quoted inSeismic & Load · 05

  • GUOHUA

    IT cabinet load test report — 3 pages

    Third-party inspection report: outline dimensions, surface finish, mechanical connections, salt-mist exposure and static load. It is the document behind the static load figures the Rack Selection guide quotes — 1,000 kg on the standard frame, 1,500 kg on reinforced-frame models.

    Quoted inRack Selection · 01

  • GUOHUA

    Cold aisle containment test report — 4 pages

    Third-party inspection report: containment layout, fasteners, surface treatment and earthing resistance. The 1.5 mΩ earthing measurement carried on the Power & Grounding guide is taken from it, read against the requirement of not more than 10 mΩ.

    Quoted inCold Aisle Design · 03Airflow & Cooling · 02

  • ISO

    ISO 9001:2015 / ISO 14001:2015 / ISO 45001:2018 — certificates ship with the order

    Management system certificates issued to the manufacturing site by Zhongbiao Lianhe (Beijing) Certification. The three scans are on the Quality page; printed copies go out with the shipping documents.

    Read onQuality & certificates

  • TM

    Trademark registration · 3 granted utility model patents and 1 software copyright

    The mark is registered, not licensed in. The patents cover a cabinet with a built-in temperature display, a cabinet with built-in lighting, and an upright-frame cabinet with both; the software copyright is the Cold/Hot Aisle Management System V1.0. Grant papers are available on request with the model you are specifying.

    Read onQuality & certificates

  • HIGH-TECH

    National high-tech enterprise certificate

    Issued to the company and reproduced with the patent papers on the Quality page. It is a standing document: no product figure in these guides is drawn from it.

    Read onQuality & certificates

Ask Send the model you are specifying and we return the matching document set with the drawings — request the full document set, or read the three reports sheet by sheet on Quality & certificates.

Boundaries

What these guides do not claim.

  • No protection rating on a mesh-door cabinet

    Position, cleaning interval and enclosure are what we specify instead.

  • No fire-class claim on containment panels

    We describe what the panel does: it flips open, so the agent can enter the aisle volume.

  • No facility-level certification claim

    That class of certification belongs to a facility, not to a cabinet supplier.

  • No thermal capacity figure

    Capacity depends on your room, your supply temperature and your IT load. What is tested is the outcome: 25%+ against a conventional open layout.

Tender usage

Turning a guide into a technical requirement.

Tender usage
Copy the specification line Each guide ends with a block that can go straight into your technical requirement.
Attach the test report that matches it Three third-party reports are listed with their page counts; send the one that covers the number you are defending.
Write the check that can be measured on site Mesh ratio, bonding continuity and blanking coverage can all be checked after installation.
Leave the rest to the contractor Room-level cooling, distribution and fire systems are not cabinet scope, and should not be written as if they were.

Glossary

Terms, in the sense used on these pages.

  • U

    the mounting unit of 19-inch equipment; 42U = 2000 mm and 47U = 2200 mm external height

  • mesh ratio

    the open area of a perforated door, as a percentage of its face

  • static load

    the load a cabinet carries standing still, not a lifting or transport rating

  • front-to-back airflow

    supply air enters the front face and leaves the rear face

  • cold aisle

    the aisle fed with supply air, in front of the equipment intakes

  • hot aisle

    the aisle that collects exhaust air, behind the equipment

  • containment

    the enclosure that keeps supply and exhaust air in separate volumes

  • blanking panel

    a closed panel that fills unused U space so air cannot recirculate through it

  • in-row cooling

    cooling units placed inside the row, taking return air from the hot side

  • reserved mounting position

    a prepared position for a busway or PDU, left for the equipment you choose

Both ends

Where the tree connects.

Upstream — what is being specified

Downstream — who specifies it

Send us the row length, the deepest chassis and the room conditions. We answer with a specification sheet and a drawing set.

Request the drawing set