Single Filter | spiair2

Why Single Filtration Isn't Enough

Airbone Transmission Risk

Bacteria

Mold

Entering

from outisde

Pollen& Dust

Infected person can spread the virus through respiratory particles when they exhale, talk or cough.

PM2.5

Virus

:PM2.5

Evaporator core is always damp from condensation. It’s an environmental ideal for breeding mold, fungi and bacteria. Every time you turn on your AC fan, these pollutants enter the car interior unfiltered. There is no air filtration from the evaporator to the air intake entering the vehicle interior.

Evaporator

Cabin filter

ISSUE 1 - System Design Flaw

Cabin filters sit before the evaporator

ISSUE 2 - Filtration Limits

Standard filters trap particles ≥ 5-10 ㎛

Even HEPA filters only capture down to 0.3 ㎛

The evaporator remains damp, allowing mold and bacteria to grow.

These contaminants enter the cabin air unfiltered, re-contaming air that has already passed thorugh the filter.

PM2.5 → 2.5 ㎛ and smaller

*UFPs → <0.1 ㎛ (the majority of airborne particles)

*UFP (Ultra Fine Particles)

Bottom Line:

A single passive cabin filter cannot protect drivers from today's real in-car air qulaity risks

Placement flaw + insufficient filtration = ineffective protection

Dual-Stage Cabin Filtration - What is different ?

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