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IEC/PAS 62587 โ Performance Measurement of Portable Household Room Air Cleaners
With the growing global concern over indoor air quality, portable air cleaners have become a household necessity. IEC/PAS 62587 provides a standardized method for measuring their performance — encompassing cigarette smoke, test dust, and paper mulberry pollen — enabling consumers to compare products on a level playing field.
💡 Why it matters: Without a standardized test method, manufacturers could cherry-pick test conditions to inflate performance claims. IEC/PAS 62587 ensures that CADR (Clean Air Delivery Rate) values are measured consistently across all products.
1 📋 Scope and Purpose
IEC/PAS 62587:2008, published as a Publicly Available Specification, defines a uniform test methodology for measuring the performance of portable household electric room air cleaners. The standard addresses the following key pollutants:
- Cigarette smoke — representing fine particulate matter from combustion sources
- Test dust (Arizona road dust) — representing larger airborne particles from outdoor infiltration
- Paper mulberry pollen — representing biological aerosol allergens
The core performance metric derived from these tests is the Clean Air Delivery Rate (CADR), expressed in cubic feet per minute (CFM) or cubic metres per hour (m³/h). The CADR quantifies the volume of particle-free air delivered by the air cleaner for each pollutant type.
The standard also covers measurement of operating power and standby power, providing a complete energy-efficiency picture alongside particle removal performance.
2 🏭 Test Chamber and Setup Requirements
2.1 Test Chamber Specifications
The standard mandates a controlled-environment test chamber with precise specifications:
| Parameter | Requirement | Rationale |
|---|---|---|
| Chamber volume | 28.5 m³ (1008 ft³) | Representative of a medium-sized room |
| Temperature | 23.3 ± 1.1 °C | Standard room temperature |
| Relative humidity | 40 ± 5% | Controls particle hygroscopic growth |
| Air exchange rate | ≤ 0.05 air changes per hour | Minimizes natural decay interference |
| Ceiling height | 2.13–2.54 m | Typical residential ceiling range |
| Interior surface | Non-static, non-shedding | Prevents particle adsorption artefacts |
⚠️ Important: The chamber air exchange rate must be extremely low. Any natural leakage introduces error in the measured particle decay rate, artificially inflating or deflating the CADR. Sealing must be verified before each test series.
2.2 Instrumentation
The standard specifies the particle measurement instrumentation:
- Particle counter or photometer — capable of measuring particle concentration in the 0.09–1.0 μm size range for smoke, and up to 10 μm for dust and pollen
- Data logging system — recording particle concentration at intervals of ≤ 2 minutes
- Temperature and humidity sensors — for environmental monitoring throughout the test
- Power meter — for measuring operating and standby power consumption
3 📈 Test Procedures and Calculation Methods
3.1 Cigarette Smoke Test Procedure
This is the most commonly referenced CADR test. The procedure involves:
- Generating cigarette smoke inside the sealed chamber using standardized cigarettes (or equivalent)
- Using a mixing fan to uniformly distribute the smoke throughout the chamber
- Allowing the particle concentration to stabilize for 2–3 minutes
- Turning on the air cleaner at maximum speed
- Recording particle concentration decay over a 20-minute period
- Calculating the CADR from the exponential decay constant
3.2 Dust and Pollen Test Procedures
Similar in principle to the smoke test, but with different particle size ranges and generation methods:
| Pollutant | Particle Size Range | Generation Method | Typical CADR Range (CFM) |
|---|---|---|---|
| Cigarette smoke | 0.09–1.0 μm | Burning standard cigarettes | 50–300 |
| Arizona test dust | 0.5–3.0 μm | Aerosolized dry powder | 40–250 |
| Paper mulberry pollen | 5–11 μm | Aerosolized dry pollen | 60–350 |
✅ Key insight: An air cleaner’s CADR is highest for large particles (pollen, which is easily captured by mechanical filtration) and lowest for fine particles (dust). A high smoke CADR is the best indicator of overall filtration capability because it targets the most challenging particle size range.
3.3 Power Measurement
The standard requires measurement of both operating power (at maximum speed) and standby power. These measurements combined with CADR values enable calculation of the energy efficiency metric — CADR per watt (CADR/W), which is a key parameter for eco-labeling programmes.
4 📊 Engineering Design Insights
4.1 Interpreting CADR Values for Real-World Application
Understanding what CADR values mean in practical terms is essential for product selection:
- A smoke CADR of 100 CFM means the air cleaner effectively delivers 100 cubic feet of smoke-free air per minute
- For a 300 ft² room with 8-ft ceilings (2400 ft³), a 150 CFM smoke CADR provides approximately 3.75 air changes per hour
- The AHAM (Association of Home Appliance Manufacturers) recommends a CADR of at least 2/3 of the room area in ft²
🚨 Design warning: CADR values are measured at maximum fan speed. At lower speeds, CADR can drop to 30–50% of the rated value. Always check the noise-CADR trade-off — a unit with high CADR but excessive noise (above 55 dBA) may be impractical for bedroom use.
4.2 Filter Technology and CADR Implications
| Filter Technology | Particle Range | Typical CADR (smoke) | Noise Level | Maintenance |
|---|---|---|---|---|
| HEPA (H13/H14) | ≥ 0.3 μm | 150–300 CFM | 45–60 dBA | Replace 6–12 months |
| Electrostatic precipitator | 0.1–10 μm | 100–200 CFM | 35–50 dBA | Clean collector plates |
| Carbon + pre-filter | ≥ 1.0 μm | 50–120 CFM | 40–55 dBA | Replace 3–6 months |
| Combination (HEPA + carbon) | Full range | 150–350 CFM | 50–65 dBA | Dual replacement schedule |
4.3 Standby Power and Energy Labelling
The standard requires standby power measurement in addition to operating power. Modern eco-design regulations (such as EU 1275/2008 for standby) set maximum standby power at 1–2 W. Air cleaners with standby power exceeding 1 W may not qualify for energy labels in some jurisdictions, regardless of CADR performance.
Frequently Asked Questions
Q1: Is IEC/PAS 62587 the same as the AHAM AC-1 standard?
IEC/PAS 62587 was harmonized with the AHAM AC-1 standard (which originated in the United States). The test chamber, procedures, and CADR calculation methodology are largely equivalent. In 2013, the PAS was technically revised and published as IEC/FDIS 62587 to align more closely with the evolving AHAM standard.
Q2: Does CADR apply to gases and volatile organic compounds (VOCs)?
No. CADR as defined in this standard applies to particulate matter only. Gas-phase pollutants (VOCs, formaldehyde, ozone) require different test methods and are typically addressed by separate standards such as ISO 16000 series for gaseous air cleaning.
Q3: Why is paper mulberry pollen used instead of ragweed or grass pollen?
Paper mulberry pollen was selected because of its consistent size (8–11 μm), spherical shape, and commercially available supply with stable characteristics. This ensures reproducibility across different testing laboratories.
Q4: How does the test chamber size affect CADR results?
The standard chamber volume of 28.5 m³ was chosen to balance particle decay time (large enough for stable decay measurement) with practical testing logistics. Results from different chamber sizes are not directly comparable — which is why the standard strictly mandates the chamber dimensions.
