Filtration soil under closet slider

Filtration soil around the perimeter

Airflow under door deposits soil on carpet

Filtration soil

Filtration soil

Filtration soil

Lack of returns

Filtration soil

Filtration soil

Filtration soil under closet slider

Filtration soil

Filtration soil

Airflow through walls causes dark soil

Filtration soil

Filtration Soiling / Draft Marking (Carpet)

Floor Detective® Claims and Conditions Guide

Summary

Filtration soiling, also known as draft marking, is an appearance condition that occurs when pressure differentials (air pressure imbalances between spaces) drive airborne particulates through carpeted areas, causing the carpet to function as a passive air filter. Fine dust, soot, and oily vapors become deposited within the pile as air moves along structural gaps, seams, and penetrations. The condition develops over time due to building airflow behavior and environmental exposure. It does not originate from

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