The warmer air actually heads towards cooler temperatures bringing it down to the carpet as the air tries to pass through the narrow gaps between the floor and wall or.
Filtration lines in carpet.
As warm air rises in your home particularly when your furnace is running it carries dust allergens and pollutants throughout your home.
Filtration lines sometimes referred to by other names.
Filtration lines soiling are those dark lines or bands of soils that you find along walls under doors that are kept closed for a length of time under the skirting of furniture and more.
Filtration soiling occurs as a result of air being forced into the room or space at a higher rate than it can escape from the same area via the ventilation system.
Air circulation causes the carpet to act like a filter trapping small airborne dirt oil dust and carbon between the wall and carpet or under doorways.
Their makeup is oily and the molecules of the soils are so small that cleaning them or removing them from fibers is difficult.
Smog lines soil lines soil filtration lines and perimeter soiling are basically any darkened or overly dirty places in a carpet normally appearing as black lines or soiled areas at the edges of the room.
Since a carpet slopes down along a wall and is no longer flush when there are filtration lines the majority of the soil and dirt build up develops in cracks.
In order to improve existing filtration lines you will need harsh cleaners and a stiff brush to work at it by hand.
What causes carpet filtration lines.