ASTM E3273-21

ASTM E3273-21

Standard Practice to Assess Microbial Decontamination of Indoor Air Using an Aerobiology Chamber

Airmid Healthgroup provides independent, third-party laboratory testing to ASTM E3273-21 – Standard Practice to Assess Microbial Decontamination of Indoor Air Using an Aerobiology Chamber, supporting manufacturers of air cleaning, air disinfection, and infection-control technologies seeking scientifically rigorous, defensible efficacy data.

This standard establishes a controlled, repeatable method for evaluating the ability of technologies to reduce viable airborne microorganisms in a well-characterized chamber environment, enabling credible performance claims for:

• Air cleaners & air purifiers

• UV-C and other germicidal systems

• Photocatalytic oxidation (PCO) devices

• Bipolar ionization & plasma technologies

• Emerging air disinfection concepts

Why ASTM E3273-21 Matters

ASTM E3273 is the first dedicated consensus standard focused specifically on microbial decontamination of indoor airusing an aerobiology chamber approach.

It provides a critical bridge between:

• Engineering performance testing

• Microbiological efficacy assessment

• Realistic indoor air exposure scenarios

High-quality ASTM E3273 testing allows manufacturers to:

• Quantify log reduction of airborne microorganisms

• Demonstrate technology efficacy under controlled conditions

• Support regulatory submissions and certifications

• Substantiate marketing and product labeling claims

Airmid Healthgroup has been deeply involved in advancing aerobiology chamber science and standardization and operates purpose-built infrastructure aligned with this practice.

Our ASTM E3273 Testing Capability

At Airmid Healthgroup, ASTM E3273 testing is conducted using fully instrumented aerobiology chambers with validated bioaerosol generation, sampling, and enumeration workflows.

Typical Test Configuration

• Chamber volumes: 1 m³, 3 m³, and larger custom chambers

• Test microorganisms (examples):

  • Bacteriophage (e.g., MS2)

  • Bacteria (e.g., Staphylococcus aureus)

  • Fungal spores (e.g., Aspergillus spp.)

• Controlled environmental conditions:

  • Temperature

  • Relative humidity

  • Air exchange rate

• Exposure durations: technology- and use-case–specific

Primary Outputs

• Airborne concentration vs. time profiles

• Log₁₀ reduction calculations

• Kill rate / decay constants

• Technology-on vs. natural decay controls

Aerobiology Chamber Testing Infrastructure

Our chambers are engineered specifically for bioaerosol research and performance testing, enabling precise control of:

• Bioaerosol generation and particle size distribution

• Mixing and spatial uniformity

• Environmental parameters

• High-efficiency bioaerosol sampling

This infrastructure enables highly repeatable, statistically robust application of ASTM E3273.

What We Deliver

Each ASTM E3273 project includes:

• Customized test plan aligned to ASTM E3273

• Defined microorganism selection and justification

• Chamber qualification and control documentation

• Raw and processed microbiological data

• Calculated log reductions and performance metrics

• Final signed test report suitable for regulatory, certification, and commercial use

Optional add-ons:

• Multiple microorganisms

• Multiple operating modes / fan speeds

• Comparative benchmarking vs. competitors

• Method development for novel technologies

Who This Service Is For

• Air cleaner & air purifier manufacturers

• UV-C system developers

• HVAC-integrated air treatment suppliers

• Medical device & infection-control companies

• Startups developing novel air disinfection technologies

Why Airmid Healthgroup

• Preeminent contract research laboratory in aerobiology & infectious aerosols

• Deep experience with airborne pathogen testing

• Purpose-built exposure chambers and microbiology laboratories

• Trusted partner to global brands and standards bodies

We don’t simply execute a standard — we help you translate scientific performance into credible product claims and market advantage.

Typical Project Flow

1. Technical consultation & scope definition

2. Microorganism & test condition selection

3. Device intake & pre-test checks

4. Chamber testing to ASTM E3273

5. Data analysis & reporting

6. Final signed report issued

Frequently Asked Questions

Is ASTM E3273 a pass/fail standard?
No. It is a standard practice. Results are reported as quantitative performance metrics (e.g., log reduction).

Can prototypes be tested?
Yes. We routinely test early-stage and prototype devices.

Can this support regulatory submissions?
Yes. Data are commonly used to support EPA, FDA, and international regulatory pathways depending on product category.

How long does testing take?
Typical projects complete within 3–5 weeks, depending on scope.

Related Services

• ISO 15714 Air Cleaner Performance Testing

• AHAM AC-1 / AC-5 CADR Testing

• GB/T 18801 CADR Testing for Gaseous Pollutants

• Antimicrobial Surface & Material Testing

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Speak With Our Team

If you are developing or commercializing air disinfection or air cleaning technologies and need ASTM E3273 microbial decontamination data, we would be delighted to discuss your project.

👉 Contact Airmid Healthgroup to scope your ASTM E3273 testing program.