Have saved me good money. Those things were cheaper by half than in the furniture store where I bought the filters for years. For my needs, the filters hold back for 1 1/2 to 2 years. Tip: Take a look at the Air Force previously extractors carefully
Since I can go because of the ventilation system air only, the Air Force with the activated carbon filter cartridges is exactly right. A little pricey perhaps, in view of the regular shift, but good.
