The Nordic Pure Window AC Filter with Carbon 15 by 24 pad is a convenient size that fits most room air conditioner units. However, if that doesn't work, just cut the filter to fit your window unit. This Window AC Filter with Carbon has 2 layers of electrostatically charged material that will reduce dust, dirt, pollen, mould spores, pet dander and other allergens as well reduce the odours in your home or office. This air filter replacement will provide you with fresh and clean air while increasing the efficiency of your unit. It is recommended that the filter be replaced every 30-60 days depending on your living environment. This filter can be used as a replacement filter for part numbers AC-302, F1524, F1663, FG11524.2, KK500, 9808, and 1285234.