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Filter Cartridge Beta Ratio & Efficiency Calculator engineering
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Filter Cartridge Beta Ratio & Efficiency Calculator

Calculate ISO 16889 multi-pass test Beta ratio (βx), removal efficiency percentage, Log Reduction Value (LRV), and cartridge dirt holding capacity service life.

Particle Challenge Counts (ISO 16889)

Dirt Holding Capacity & Service Life

Cartridge Rating & Lifetime

Removal Efficiency
--%
Absolute Rated Filter (β ≥ 200)
Beta Ratio (βx)
--
β_5.0 rating
Log Reduction (LRV)
--
log10(β)
Est. Operating Life: -- hours
Throughput to Plug: -- Gallons
Contaminant Influx: -- g/hr
An absolute rating of β ≥ 200 guarantees 99.50% particle removal, whereas β ≥ 1000 provides 99.90% high-purity capture.

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Frequently Asked Questions

What is the ISO 16889 Beta ratio (βx)?

The Beta ratio is the ratio of particle counts upstream of the filter to particle counts downstream of the filter for a specified particle diameter x: βx = N_upstream / N_downstream. For example, if 100,000 particles enter and 500 pass through, β = 200.

What is the exact distinction between "Absolute" and "Nominal" filter ratings?

A "nominal" rating is an arbitrary manufacturer claim with no standard definition, often meaning as little as 50% to 85% of particles are stopped. An "absolute" rating adheres to ISO 16889 or ASTM standards, officially defined as a Beta ratio of β ≥ 200 (99.5% efficiency) or β ≥ 1000 (99.9% efficiency).

How is Dirt Holding Capacity (DHC) used to predict replacement intervals?

DHC represents the total mass (in grams) of standardized test dust a filter element can trap before differential pressure reaches the maximum allowable terminal limit (typically 25 to 50 psid). Dividing DHC by the hourly contaminant mass influx gives expected service life in operating hours.