ISO ePM1 Filters

About ISO ePM1 Filters

ISO ePM1 filters are used in air filtration systems where fine particle control is a priority. According to ISO 16890, the ePM1 classification applies to filters tested for their efficiency in capturing particulate matter up to 1 micrometer.

These particles are small enough to remain suspended in the air for long periods and are often associated with urban pollution, combustion sources, and sensitive indoor environments.

In commercial and industrial HVAC systems, ISO ePM1 filters are commonly used where improved indoor air quality, cleaner airflow, and better protection for downstream equipment are required. They are often selected as medium- to high-efficiency filtration stages in multi-stage air handling systems.

Typical Particle Size

ISO ePM1 filters are designed to target fine particles:

• ≤1 µm

These may include:

• combustion particles
• fine urban pollution
• smoke-related particulates
• very fine airborne dust
• particles that can affect sensitive processes and equipment

Key Features

• Effective filtration of fine airborne particles
• Improved indoor air quality performance
• Suitable for demanding HVAC and technical applications
• Helps protect coils, ducts, and downstream filters
• Supports cleaner air in controlled and high-expectation environments
• Available in multiple product forms and efficiency levels

Typical Applications

ISO ePM1 filters are commonly used in:

• Commercial HVAC systems
• Hospitals and healthcare facilities
• Data centers and technical rooms
• Laboratories and controlled environments
• Office buildings in high-pollution areas
• Industrial air handling systems requiring fine particle control

Selection Considerations

ISO ePM1 filters are typically selected when finer particulate removal is needed beyond coarse or ePM10/ePM2.5 filtration. They are suitable for applications where air cleanliness, occupant comfort, and equipment protection are important.

When selecting ISO ePM1 filters, important factors include:

• required indoor air quality level
• system airflow and pressure drop limitations
• local pollution conditions
• maintenance cycle expectations
• downstream filtration strategy
• energy efficiency goals

A correctly selected ISO ePM1 filter can help improve overall system cleanliness while supporting stable HVAC performance.

ISO ePM1 vs Other ISO 16890 Grades

ISO ePM1 filters are designed for finer particle control than ISO Coarse, ISO ePM10, or ISO ePM2.5 filters. While ISO Coarse focuses on larger particles and ePM10/ePM2.5 filters address broader particulate ranges, ePM1 filters are better suited to applications where finer airborne particles are a concern.

This makes ISO ePM1 filters a common choice for environments with higher air quality expectations or more sensitive operating conditions.

ISO ePM1 FAQ

What does ISO ePM1 mean?

ISO ePM1 refers to a filter classification under ISO 16890 for filters that are effective at capturing particulate matter up to 1 micrometer.

Where are ISO ePM1 filters typically used?

They are commonly used in hospitals, data centers, offices, laboratories, and commercial HVAC systems where fine particle control is important.

Are ISO ePM1 filters the same as HEPA filters?

No. ISO ePM1 filters improve fine particle filtration, but HEPA filters operate at a much higher efficiency level and are typically used in more critical environments.

How is ISO ePM1 different from ISO ePM2.5?

ISO ePM1 filters are designed for smaller particles and are generally used when finer particulate control is required.

Can ISO ePM1 filters be used in multi-stage filtration systems?

Yes. They are often installed after coarse filtration and before HEPA or terminal filtration stages where additional protection is needed.