Fiberglass air filters are very thin and they have a simple flat panel surface for trapping particles from the air. They were originally developed to protect your heating and air conditioning equipment, not to improve your indoor air quality. They can often be purchased for less than $1 apiece. Unfortunately, they remove less than 10% of the air pollutants from your home. They have a MERV rating between 1 and 4.
8p this past saturday this dude in his mid 20s came to my door selling something similar. he led on that he represented (was subbed for) the utility company. he kept insisting that he needed to see my water shutoff valve and he had something that would save me a lot of money (more money than i actually pay in water consumption!). i kept letting him talk just to shoot down his bullshit circle talking, it was more amusing for me to troll his nonsense and keep him in the cold while wasting both our times. definitely didn't let him in. interesting how others also agree this was bullshit, yet sad to know others fall for this.
Installing a washable, reusable air filter can help save you money over disposable filters—which must be frequently repurchased (approximately every 90 days in the average suburban home, and every 60 days or sooner if you have pets). Instead of fully replacing your filter several times a year (which can be very costly), simply wash and reinstall your new K&N® lifetime washable home air filter in your cooling and heating system.
Ensuring that your filter fits properly in your HVAC system means making sure that you have not only the right length and width, but also thickness of your filter. Most standard air filters are 1 - 2 inches in thickness. Whereas media filters are typically 3 to 5 inches in thickness. The best way to measure your air filter size is to get out the measuring tape and measure it directly.
These filters can trap very small particles of dust, pollen, mold, and other irritants. Some of these filters work much like the air and oil filters in your car. They are made using pleated filter paper. Other filters are made with fine synthetic polyester fibers. Higher efficiency air filters can sometimes be coated with chemicals that can kill tiny microbes such as bacteria and mold. There are several advantages to using these higher efficiency air filters. Not only will your heating and cooling equipment perform better, your operating costs may well be lower. The air you breathe will be cleaner, as will your furniture and drapes. That $60 service call could have bought 10 filters that may have lasted through five cooling seasons!  Source
You may not realize that the air inside your home can be even dirtier than the air outside in the environment, and a high-quality air conditioning and furnace filter can help improve the quality of the air that you breathe! Each K&N lifetime washable home furnace filter is engineered to provide exceptional capturing capability for airborne contaminants such as bacteria, mold, spores, dust mites, and carpet fibers—and helps protect your family from allergens including pollen, pet dander, and dust.
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