The pleated design of this filter allows it to last up to 3 months.
If you're interested in a basic filter to protect your furnace, and capture nuissance dust such as lint and dust particles, this MERV 5 efficiency filer can help. This filter provides basic furnace protection from large particles. Unlike flat panel fiberglass filters tha tmust be changed monthly, the pleated design of this filter allows it to last up to 3 months. Available in 4 sizes including 16"x20"1".