What Are Filtration Lines?
Today I want to talk to you about what we call filtration lines. It’s dark shadows that often times develop over time. There will be noticeable edges against walls and underneath a doorway are areas where it’s typical. The carpet right in front of a cold air return on a wall. Carpet around the heat vent or heat register in the floor are some comment typical areas. They are called filtration lines because that is the process that leads to the discoloration.
Some customers when it’s at the edge of the carpet and they’ll think that is just dust and debris and bring in a carpet cleaner. “Oh look, they didn’t even clean the edges good. They didn’t get the lint and dust from the edges. I can see them and they’re still dark.”
A small part of what’s there is dust and lint. The amount that’s dust and lint can be vacuumed up. There something more going on there than just dust and lint settling out of the air.
A lot of areas in a lot of home have central heat and central cooling. Forced air heat. As that furnace kicks on, it’s creating an air pressure. It;s pushing air through the duct working creating an air pressure into the extent that there is air pressure differentials. It not only pushed the air through the duct work and up out of the vent and registers, the difference in air pressure from one room to another or from one room to a wall cavity or from one level to another causes air to flow through wall. Through cracks. Through floors. It causes air flow to a small degree. When air is being forced through that crack at the bottom of the wall, the floor covering is carpet, the air is being forced over and through those carpet fibers that are at the edge of the wall covering up the crack.
Over time, over long periods of time. Months and years, that cumulative air being forced through those fibers are forced to act like a filter. Yes, that’s the lint will be collected on those fibers, but also other impurities out of the air.
Those are not easily removed. They don’t come out with vacuuming. For the most part, they don’t come out with regular carpet cleaning. There are some additional products, mostly available only to professional carpet cleaners that can be employed and can be used. You are able to get most of it. It takes extra chemicals. Extra time. Extra work and a lot of hand work.
It develops underneath doors as well. Again, doors are closed so the air is forced under the door. As the air goes under the door it’s passing through those carpet fibers that are under the door. This is another typical place.
That’s what those dark areas and shadows and lines are from. They are not easy to get out. Plan on extra work to get out those filtration lines.