What characteristic should ducts possess to ensure effective airflow over filters?

To ensure effective airflow over filters, ducts should provide even distribution. This characteristic allows air to flow uniformly across the entire surface of the filter, which is crucial for promoting optimal filtration efficiency. When the airflow is evenly distributed, it prevents localized areas of high velocity or excessive pressure, which can lead to inefficient filter operation and potential bypassing of contaminants.

Even distribution helps maintain consistent airflow rates through the filter media, thus maximizing its ability to capture particles and improve overall air quality. This characteristic also contributes to the longevity of the filter, as it minimizes the risk of overloading certain sections of the filter with dirt and debris, allowing the entire filter to perform effectively for longer periods.