Does the internal weather filter clog?

The internal weather filter will not clog significantly over time.

The internal weather filter will not clog significantly over time. A 10-year accelerated dust exposure test conducted in accordance with an accepted industry standard test criteria showed that the filter is restricted by only 5%. This small collection of dust may result in discoloration of the filter over time. The filter is untreated, non-woven fiberglass material that is not designed to provide the same filtration performance as a central heat and air conditioning filtration system. It is not designed to trap (collect) dust particles from the air that travels through the ridge vent. However, over time, passing moisture and dust may collect in small amounts. This collection will be enough to cause a darkening of the filter, which may appear dusty, but is not affecting performance substantially. Care should be taken to avoid contaminating the filter with building materials such as saw dust, blown-in insulation, etc.