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SECTION 12 / 20

Air Cleanliness Engineering

Air cleanliness engineering covers the measurement, specification, and control of airborne contaminants in industrial contexts — including engine intake air, compressed air for instrumentation and process applications, and operator cabin air. Each application has distinct contaminant types, measurement standards, and cleanliness targets.

01 / ENGINEERING PURPOSE

Air contamination causes three distinct damage mechanisms: particulate ingestion causing abrasive wear in engines, compressed air contamination causing instrument malfunction and process quality failures, and airborne dust causing operator respiratory disease. Each requires a different measurement standard and technology response.

02 / APPLICABLE STANDARDS

ISO 5011ISO 8573-1ISO 11155-1SAE J1539DIN 71460

03 / KEY CONCEPTS

Engine intake air quality

Engine air intake filters capture airborne dust to prevent abrasive wear in cylinder bores, piston rings, and valve seats. Silica (quartz) particles — the primary component of soil and mineral dust — are extremely abrasive at hardness 7 Mohs. Efficiency measured per ISO 5011; service determined by restriction indicator.

Compressed air purity classes (ISO 8573-1)

Specifies compressed air purity using three class numbers (Particle:Water:Oil). Instrument air: Class 2:4:1. Food contact: Class 1:2:1. General pneumatics: Class 5:4:3. Each class defines maximum contamination concentration — particle, pressure dewpoint, and total oil content.

Cabin air filtration

Operator cabin filters protect personnel from ambient particulate (PM₂.₅, PM₁₀, silica dust, grain dust, bioaerosols) and gas-phase contamination. Mining and construction cabs may have silica concentrations exceeding 100× the OSHA PEL. MICROKAPPA™ elements are rated to the PM₂.₅ efficiency class specified for the approved application per ISO 11155-2.

Dust concentration by industry

Mining: 0.1–5 mg/m³ at equipment. Agriculture (harvest): 500–2,000 mg/m³ around combines. Drilling operations: barite/silica dust at drilling platform level — PENDING ENGINEERING DOCUMENTATION (quantification not yet in ELIMFILTERS Technical Doctrine). Road construction: 1–10 mg/m³ (PENDING ENGINEERING DOCUMENTATION).

PM₂.₅ and PM₁₀

Respirable particulate matter classifications: PM₁₀ = particles ≤10 µm aerodynamic diameter; PM₂.₅ = particles ≤2.5 µm. PM₂.₅ penetrates deepest into the respiratory tract. ISO 11155-2 measures cabin filter efficiency against PM₂.₅. MICROKAPPA™ is rated to the PM₂.₅ efficiency class specified for the approved application, up to H13-class where required.

04 / ENGINEERING METRICS

Mining dust concentration

0.1–5 mg/m³

Harvest dust concentration

500–2,000 mg/m³ (combine proximity)

DRYCORE™ moisture control[ISO 8573-1]

Per approved pneumatic brake-system application

NA engine restriction limit[ISO 5011]

25 mbar / 10 inH₂O

Silica Mohs hardness

7 (vs steel 5–6.5)

05 / FAILURE CONSIDERATIONS

Pre-cleaners not installed in high-dust environments — mining, harvest — overload primary filter elements within hours, requiring emergency service intervals that interrupt operations.
Compressed air contamination above ISO 8573-1 specification causes instrument calibration drift and pneumatic actuator stiction — often misdiagnosed as process control or mechanical faults, not air quality.
Cabin filter service intervals not adjusted for harvest season result in PM₂.₅ breakthrough during the highest-exposure period, directly increasing operator silicosis and occupational disease risk.

06 / RELATED ELIMFILTERS TECHNOLOGIES

MACROCORE™INTEKCORE™DRYCORE™MICROKAPPA™

07 / RELATED ENGINEERING ARTICLES

Airflow Engineering →
Air Restriction →
Dust Holding Capacity →

ISO 5011:2020 — Inlet air cleaning equipment for internal combustion engines

ISO 8573-1:2010 — Compressed air — Contaminant classes and purity requirements

ISO 11155-1:2001 — Road vehicles — Air conditioning and ventilation

DIN 71460 — Air filters for passenger compartments of motor vehicles

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