What causes dirty marks under doors and along skirtings?
October 23, 2011 Frequently asked questions
Filtration soil may appear as dark or grayish lines on carpet along walls, stairways and under doors. It is caused by airflow over and through carpet, allowing fine soils to settle on the surface. It is often caused by an improperly balanced ventilation system, when the volume of air entering a room exceeds the system’s capacity to remove air from the room. Excess air then seeks exit sources in gaps along walls and stairways.
How to minimise filtration soiling
- Prevent the airflow through carpet and carpet edges by sealing openings through the carpet and under doors and skirting
- Keeping the air in the area clean and using good filtration in your heating and cooling systems and vacuum cleaners can help
- Filtration soils may require special cleaning treatment for effective removal