When designing a dust collector for a silo, the following information is required: fill line size; quantity of lines filling at one time; air flow and pressure; loading time and material handled. Most applications use a single 4" or 5" diameter fill line running at 350 cfm @ 12-15 PSI for approximately 45 minutes. The material handled is either cement, flyash, or sand. A mechanical shaker dust collector with 250 sq.ft. of cloth area will be adequate for these applications.