先明确目标：ISO 14644-1 Class 8 是数据中心的洁净度基线

Set the Target First: ISO 14644-1 Class 8 Is the Data Center Baseline

ISO 14644-1:2015 按每立方米空气中的悬浮粒子最大允许浓度把受控环境分为 9 级，1 级最洁净、9 级最宽松。ASHRAE 技术委员会 TC 9.9 推荐数据中心达到 ISO Class 8，对应限值为 ≥0.5 μm 粒子不超过 3,520,000 个/m³，≥1.0 μm 不超过 832,000 个/m³（作为对照，Class 7 为 352,000 个/m³ ≥0.5 μm，用于无菌包装类环境）。它不是法律强制要求，但已被大量设备保修条款、客户合同与审计框架引用——当机房因积尘导致硬件故障时，环境洁净度记录会直接影响索赔结果。

ISO 14644-1:2015 classifies controlled environments by maximum airborne particle concentration per cubic metre, from Class 1 (cleanest) to Class 9. ASHRAE Technical Committee 9.9 recommends ISO Class 8 for data centers, which allows no more than 3,520,000 particles ≥0.5 μm per m³ and 832,000 particles ≥1.0 μm per m³ (for comparison, Class 7 allows 352,000 ≥0.5 μm and is used for aseptic packaging). It is not a legal requirement, but it is increasingly cited in equipment warranties, customer contracts and audit frameworks — when dust-related hardware failures occur, your environmental records directly affect the warranty outcome.

为什么过滤做到位还不够：室内尘源必须靠清洁消除

Why Filtration Alone Is Not Enough: Indoor Sources Need Cleaning

ASHRAE 建议机房循环风采用 MERV 8 级过滤、新风采用 MERV 11–13 级，但过滤解决的是空气中的颗粒，无法阻止室内持续产生的尘源。人员走动、纸箱与包装材料、维护作业、线缆切割与桥架施工、混凝土地面起砂，都会在过滤器下游直接释放颗粒。ASHRAE 在《Particulate and Gaseous Contamination in Datacom Environments》中明确指出，应减少数据中心内部的尘源。换句话说，Class 8 是过滤 + 气流设计 + 结构化清洁三者共同的结果，缺一不可。

ASHRAE recommends MERV 8 filtration for room recirculation air and MERV 11–13 for incoming air, but filters only address particles already in the airstream — they cannot stop sources generated inside the room. Foot traffic, cardboard and packaging, maintenance work, cable cutting and tray installation, and dusting concrete slabs all release particulate downstream of the filters. ASHRAE's Particulate and Gaseous Contamination in Datacom Environments explicitly states that internal dust sources should be reduced. Class 8 is therefore the product of filtration, airflow design and structured cleaning together.

ISO 14644-1 没有规定的部分，恰恰是清洁方案的主体

What ISO 14644-1 Does Not Cover Is Exactly Where Your Programme Lives

标准只分类空气中悬浮粒子浓度，并不规定：清洁频次与作业范围、具体的清洁方法/工具/化学品、架空地板与桥架等表面的洁净度、气态污染（气态腐蚀另由 ANSI/ISA 71.04 规定，ASHRAE TC 9.9 与 ISO 14644-1 并列引用）、以及人员出入与物料暂存规程。所以“达标”不能只买一台粒子计数器交差，必须自建清洁 SOP：明确分区、频次、工具、耗材、验证方式与记录留痕。审计时被查的往往是记录，而不是设备。

The standard classifies airborne particle concentration only. It does not specify cleaning frequency or scope, cleaning methods, tools or chemicals, surface cleanliness on raised floors and cable trays, gaseous contamination (covered separately by ANSI/ISA 71.04, which ASHRAE TC 9.9 references alongside ISO 14644-1), or entry-control and material-staging procedures. So 'compliance' is not a particle counter you buy once; it is an SOP you build: zones, frequencies, tools, consumables, verification method and records. Audits usually examine the documentation, not the hardware.

设备三条硬要求：HEPA、防静电、不掉毛

Three Hard Equipment Requirements: HEPA, ESD-Safe, Lint-Free

① HEPA 过滤吸尘：机房吸尘器必须配真 HEPA 级过滤（对 0.3 μm 颗粒过滤效率 99.97%），否则等于把地板与桥架的积尘重新打进气流；② 防静电（ESD）：静电放电可在无可见痕迹的情况下击穿芯片，机柜与设备表面必须使用防静电微纤维擦拭材料与静电耗散型清洁剂，人员需佩戴腕带、导电鞋、防静电服；③ 不掉毛：棉布与纸质材料会脱落纤维，反而增加颗粒负荷，机房内应统一使用不掉毛微纤维制品。化学品方面只允许非导电、低残留、挥发快且与洁净室材料兼容的产品，禁止在密封件附近使用含醇喷剂。

(1) HEPA filtration: vacuums used in a computer room must carry true HEPA filters (99.97% efficiency at 0.3 μm), otherwise you simply re-inject floor and tray dust into the airflow. (2) ESD safety: electrostatic discharge can destroy a microchip with no visible sign, so racks and equipment surfaces require anti-static microfiber wipes and static-dissipative cleaners, with wrist straps, conductive footwear and anti-static garments for personnel. (3) Lint-free materials: cotton and paper shed fibres and add to the particle load, so standardise on non-linting microfiber. Chemicals must be non-conductive, low-residue, fast-drying and cleanroom-material compatible; avoid alcohol-based sprays near seals.

分区清洁频次参考表

Reference Cleaning Frequency Table by Zone

可作为 SOP 起草基准（按实际风险与运行密度调整）：机柜正面与接触面——每周，防静电擦拭巾；灯具、照明与传感器表面——每月，防静电擦拭 + 检查密封；HVAC 风口与格栅——每月，先吸后擦、严禁滴液，滤网按 ASHRAE 建议更换；线缆桥架——每季度，定向气流配合 HEPA 吸尘、断电作业、不得使用液体；架空地板与地板下静压箱——每半年，起板吸尘 + 极少水分的 PVA 拖擦，复位后检查等电位连接；全设施审计与 SOP 复核——每年一次。日常还应有每日巡检做目视积尘检查。

Use this as a drafting baseline and adjust for risk and density: rack fronts and contact surfaces — weekly, anti-static wipes; luminaires, lighting and sensor surfaces — monthly, ESD wipes plus seal inspection; HVAC diffusers and grilles — monthly, vacuum then wipe with no dripping liquid, filters replaced per ASHRAE; cable trays — quarterly, directional air plus HEPA vacuum, de-energised, no liquids; raised floor tiles and the underfloor plenum — semi-annually, lift tiles, vacuum, then PVA mop with minimal moisture and check bonding after reinstatement; full facility audit and SOP review — annually. Add a daily walkthrough for visual dust checks.

ApexClean 可用于机房与电子厂房的真实设备

Real ApexClean Equipment for Computer Rooms and Electronics Plants

地板下静压箱与桥架吸尘需要“大风量 + 可移动 + 不拖线”的组合：永乐 X1-8 电瓶式工业吸尘器，风量 350 m³/h，80 L 桶容，电池 12V/100AH×2，电机 1.5 kW，整机 62 kg，无电源线束缚，适合在机柜列间与起板作业时机动使用；需要固定工位的大风量集中吸尘可选永乐 X7-5，风量 530 m³/h，380V，7.5 kW，115 kg，适合电子厂房、配电与运维通道。入口拦尘是性价比最高的一环——铝合金除尘地垫 YLDA003（垫体高度 23.5 mm / 18.5 mm，可做嵌入式凹槽安装）布置在机房前室与门厅，可在颗粒进入机房前截留大部分鞋底尘土。注意：进入机房使用的吸尘设备必须加装 HEPA 级过滤，并按 ESD 规程接地。

Underfloor plenum and cable-tray work needs high airflow, mobility and no trailing cable. The Yongle X1-8 battery industrial vacuum delivers 350 m³/h airflow with an 80 L drum, 12 V/100 Ah ×2 batteries, a 1.5 kW motor and a 62 kg body — cordless operation suits work between rack rows and during tile lifting. For fixed high-airflow extraction, the Yongle X7-5 provides 530 m³/h at 380 V, 7.5 kW, 115 kg, suited to electronics plants, switchrooms and service corridors. Entry-zone control is the cheapest win: the YLDA003 aluminium entrance dust mat (23.5 mm / 18.5 mm profile heights for recessed installation) placed in the anteroom and lobby traps most shoe-borne particulate before it reaches the white space. Note that any vacuum entering the computer room must carry HEPA-grade filtration and be grounded per ESD procedure.

落地路径：从一次基线测量到可审计的常态运行

Implementation Path: From One Baseline Measurement to Auditable Routine

建议按四步推进：① 基线——用符合 ISO 21501-4 的光散射粒子计数器按 ISO 14644-1:2015 规定的采样点方法做一次测量，确定当前所处等级；② 溯源——排查前室缺失、纸箱进机房、地板起砂、桥架施工残留等具体尘源，先堵源再清洁；③ SOP——按上表建立分区频次、指定工具与耗材、明确 ESD 与门禁要求，清洁人员须经关键环境作业培训；④ 留痕——每次作业记录区域、时间、人员、方法与验证结果，形成可供客户与审计方查阅的证据链。趋势正在收紧：AI 与高密度算力集群的热裕度更小，颗粒累积对散热效率的影响被放大，Class 8 应被视为下限而非目标。

Work in four steps. (1) Baseline: measure with a light-scattering particle counter meeting ISO 21501-4, using the sampling-location methodology defined in ISO 14644-1:2015, and establish your current class. (2) Source control: identify concrete sources — missing anteroom, cardboard entering the white space, dusting slabs, leftover tray installation debris — and eliminate them before scaling cleaning. (3) SOP: build zone frequencies from the table above, specify tools and consumables, define ESD and access requirements, and require critical-environment training for cleaning staff. (4) Records: log area, time, personnel, method and verification for every session to create an evidence chain for customers and auditors. Expectations are tightening: AI and high-density compute run on thinner thermal margins, so treat Class 8 as a floor, not a target.